Sparse restarts not bitwise exact in edge case

[lroberts36]

I think it is possible that if a controlling sparse variable does not have Metadata::Independent or Metadata::Restart set, its deallocation counter will not be written to the restart file and will be reset to zero on restart. To fix this, we would either need to ensure that controlling variables always have either Independent or Restart set or write SparseAlloc and SparseDeallocCount to file for all sparse variables (not just those that are dumped to restart files).