GEOS-Chem submod update: Merge PR #1920 (Hotfix for dry-runs)

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

216985a5d Merge PR #1920 (Hotfix: Exit INIT_PHOTOLYSIS before SET_AER for dry runs)

This fixes an issue with GEOS-Chem Classic dry-run simulations by
making sure we exit the Init_Photolysis routine before doing any
computations.

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