openPMD output is broken

[BenWibking]

Describe the bug
OpenPMD output doesn't work with the latest development commit. Discovered when testing #741.

To Reproduce
Steps to reproduce the behavior:

1. Checkout commit 60a37f0.
2. Run the HydroBlast3D problem
3. See error:

ubuntu@0301436d6d84:/workspaces/quokka/tests$ ../build/src/problems/HydroBlast3D/test_hydro3d_blast blast_32.in 
Initializing AMReX (24.09)...
MPI initialized with 1 MPI processes
MPI initialized with thread support level 0
AMReX (24.09) initialized
amrex::Abort::0:: (-2,-2,-2,6) is out of bound (0:31,0:31,0:31,0:8) !!!
SIGABRT
See Backtrace.0 file for details

Backtrace:

 0: ../build/src/problems/HydroBlast3D/test_hydro3d_blast(+0x6fa4c0) [0xaaaad180a4c0]
    amrex::BLBackTrace::print_backtrace_info(_IO_FILE*) at /workspaces/quokka/extern/amrex/Src/Base/AMReX_BLBackTrace.cpp:203 (discriminator 1)

 1: ../build/src/problems/HydroBlast3D/test_hydro3d_blast(+0x6f9dd8) [0xaaaad1809dd8]
    amrex::BLBackTrace::handler(int) at /workspaces/quokka/extern/amrex/Src/Base/AMReX_BLBackTrace.cpp:101

 2: ../build/src/problems/HydroBlast3D/test_hydro3d_blast(+0x6b9b1c) [0xaaaad17c9b1c]
    amrex::ParallelDescriptor::Abort(int, bool) at /workspaces/quokka/extern/amrex/Src/Base/AMReX_ParallelDescriptor.cpp:219

 3: ../build/src/problems/HydroBlast3D/test_hydro3d_blast(+0x62d6a8) [0xaaaad173d6a8]
    amrex::Error_host(char const*, char const*) at /workspaces/quokka/extern/amrex/Src/Base/AMReX.cpp:252

 4: ../build/src/problems/HydroBlast3D/test_hydro3d_blast(+0x62d5c0) [0xaaaad173d5c0]
    amrex::Abort(char const*) at /workspaces/quokka/extern/amrex/Src/Base/AMReX.H:160
 (inlined by) amrex::Abort(std::__cxx11::basic_string<char, std::char_traits<char>, std::allocator<char> > const&) at /workspaces/quokka/extern/amrex/Src/Base/AMReX.cpp:223

 5: ../build/src/problems/HydroBlast3D/test_hydro3d_blast(+0x36196c) [0xaaaad147196c]
    amrex::Array4<double>::index_assert(int, int, int, int) const at /workspaces/quokka/extern/amrex/Src/Base/AMReX_Array4.H:279 (discriminator 53)

 6: ../build/src/problems/HydroBlast3D/test_hydro3d_blast(+0x397750) [0xaaaad14a7750]
    double& amrex::Array4<double>::operator()<double, 0>(int, int, int, int) const at /workspaces/quokka/extern/amrex/Src/Base/AMReX_Array4.H:144
 (inlined by) AMRSimulation<SedovProblem>::AverageFCToCC(amrex::MultiFab&, amrex::MultiFab const&, int, int, int, int, int) const::{lambda(int, int, int, int)#1}::operator()(int, int, int, int) const at /workspaces/quokka/src/simulation.hpp:2049

 7: ../build/src/problems/HydroBlast3D/test_hydro3d_blast(+0x42d394) [0xaaaad153d394]
    std::enable_if<amrex::IsFabArray<amrex::MultiFab, void>::value, void>::type amrex::experimental::detail::ParallelFor<amrex::MultiFab, AMRSimulation<SedovProblem>::AverageFCToCC(amrex::MultiFab&, amrex::MultiFab const&, int, int, int, int, int) const::{lambda(int, int, int, int)#1}>(amrex::MultiFab const&, amrex::IntVectND<3> const&, amrex::IntVectND<3> const&, bool, AMRSimulation<SedovProblem>::AverageFCToCC(amrex::MultiFab&, amrex::MultiFab const&, int, int, int, int, int) const::{lambda(int, int, int, int)#1} const&) at /workspaces/quokka/extern/amrex/Src/Base/AMReX_MFParallelForC.H:26 (discriminator 3)

 8: ../build/src/problems/HydroBlast3D/test_hydro3d_blast(+0x3be0f8) [0xaaaad14ce0f8]
    std::enable_if<amrex::IsFabArray<amrex::MultiFab, void>::value, void>::type amrex::experimental::ParallelFor<amrex::MultiFab, AMRSimulation<SedovProblem>::AverageFCToCC(amrex::MultiFab&, amrex::MultiFab const&, int, int, int, int, int) const::{lambda(int, int, int, int)#1}>(amrex::MultiFab const&, amrex::IntVectND<3> const&, AMRSimulation<SedovProblem>::AverageFCToCC(amrex::MultiFab&, amrex::MultiFab const&, int, int, int, int, int) const::{lambda(int, int, int, int)#1}&&) at /workspaces/quokka/extern/amrex/Src/Base/AMReX_MFParallelFor.H:98

 9: ../build/src/problems/HydroBlast3D/test_hydro3d_blast(+0x397934) [0xaaaad14a7934]
    AMRSimulation<SedovProblem>::AverageFCToCC(amrex::MultiFab&, amrex::MultiFab const&, int, int, int, int, int) const at /workspaces/quokka/src/simulation.hpp:2053

10: ../build/src/problems/HydroBlast3D/test_hydro3d_blast(+0x3802b0) [0xaaaad14902b0]
    AMRSimulation<SedovProblem>::PlotFileMFAtLevel(int, int) at /workspaces/quokka/src/simulation.hpp:2097

11: ../build/src/problems/HydroBlast3D/test_hydro3d_blast(+0x37e514) [0xaaaad148e514]
    AMRSimulation<SedovProblem>::PlotFileMF(int) at /workspaces/quokka/src/simulation.hpp:2115 (discriminator 2)

12: ../build/src/problems/HydroBlast3D/test_hydro3d_blast(+0x36b3b0) [0xaaaad147b3b0]
    AMRSimulation<SedovProblem>::WritePlotFile() at /workspaces/quokka/src/simulation.hpp:2310

13: ../build/src/problems/HydroBlast3D/test_hydro3d_blast(+0x35d468) [0xaaaad146d468]
    AMRSimulation<SedovProblem>::setInitialConditions() at /workspaces/quokka/src/simulation.hpp:686

14: ../build/src/problems/HydroBlast3D/test_hydro3d_blast(+0x320d0c) [0xaaaad1430d0c]
    problem_main() at /workspaces/quokka/src/problems/HydroBlast3D/test_hydro3d_blast.cpp:267

15: ../build/src/problems/HydroBlast3D/test_hydro3d_blast(+0x5b066c) [0xaaaad16c066c]
    main at /workspaces/quokka/src/main.cpp:54 (discriminator 1)

16: /lib/aarch64-linux-gnu/libc.so.6(+0x284c4) [0xffffb8c684c4]

17: /lib/aarch64-linux-gnu/libc.so.6(__libc_start_main+0x98) [0xffffb8c68598]

18: ../build/src/problems/HydroBlast3D/test_hydro3d_blast(+0x31cbf0) [0xaaaad142cbf0]
    ?? ??:0


===== TinyProfilers ======
AMRSimulation::setInitialConditions()
AMRSimulation::WritePlotFile()

Additional context
We don't currently have a CI test for openPMD output.