Bug fix: avoid double-counting of HCl uptake on alkaline sea salt aer…

…osols

This fix corrects the issue first reported by Viral Shah in
geoschem/geos-chem #1034.  We only need to do HCL uptake when
SO2 chemistry is called with when FullRun=.TRUE..  The quick fix was
to add FullRun to the IF block where the computations occur.

NOTE: This issue does not occur in the new KPP sulfur chemistry code:
KPP/fullchem/fullchem_SulfurChemFuncs.F90.

Signed-off-by: Bob Yantosca <yantosca@seas.harvard.edu>

GeosCore/sulfate_mod.F90

@@ -4705,7 +4705,7 @@ SUBROUTINE SEASALT_CHEM( I,          J,         L,         &
     ENDIF
 
     ! HCl lost [eq/timestep] converted back to [v/v/timestep]
-    IF ( id_HCl > 0 ) THEN
+    IF ( FullRun .and. id_HCl > 0 ) THEN
        HCl_ss = ( TITR_HCl * AIRMW / AD(I,J,L) ) / 1000.0_fp
        Spc(I,J,L,id_HCl) = MAX( HCl_vv - HCl_ss, MINDAT )
     ENDIF