Bug when using monthly history output

[mathomp4]

The PR to try and update GEOSgcm to v2.35.0 showed a run-time bug when running a monthly history:

 DEBUG: monthly averaging is active for collection tavg2d_aer_x
 DEBUG: monthly averaging is active for collection tavg3d_aer_p
 
 STUBBED in CPL ReadRestart
pe=00000 FAIL at line=02235    MAPL_HistoryGridComp.F90                 <status=21>
pe=00002 FAIL at line=02235    MAPL_HistoryGridComp.F90                 <status=21>
pe=00000 FAIL at line=01818    MAPL_Generic.F90                         <status=21>
pe=00000 FAIL at line=00703    MAPL_CapGridComp.F90                     <status=21>
pe=00000 FAIL at line=00648    MAPL_CapGridComp.F90                     <status=21>
pe=00000 FAIL at line=00949    MAPL_CapGridComp.F90                     <status=21>
pe=00000 FAIL at line=00299    MAPL_Cap.F90                             <status=21>
pe=00000 FAIL at line=00258    MAPL_Cap.F90                             <status=21>

I didn't catch this before because I always run GEOS with non-monthly history as I only run a day. As such, I missed this. The fix is pretty obvious after looking at this:

5611f58#diff-0c9f15d29823f78a5dbd243a38a4d15479631b4143b114eba4bcbc095255b353

and it's a mistake on my part from #1953