GEOS-Chem submod update: Merge PR #2452 (Reorder photo rxns for PNs, …

…ANs)

This commit informs the GCClassic superproject about the following
commits that were pushed to the GitHub geoschem/geos-chem repository:

a5fba9c88 Merge PR #2452 (Reorder photo rxns for PNs and ANs)

This PR reorders the photo rxns of the PN and AN species added by
@ktravis213 in PR #2318, so that they now follow PPN in the
FJX_j2j.dat configuration file for Cloud-J.

Signed-off-by: Bob Yantosca <[email protected]>