Correct file path for SO2 in hist-xaer

Author: wlin7

components/eam/bld/namelist_files/use_cases/20TR_eam_CMIP6-xaer_chemUCI-Linoz-mam5-vbs.xml

@@ -21,7 +21,7 @@
 <!-- Need to use INTERP_MISSING_MONTHS for ext_frc_volc_type to go with ths updated SO2 file -->
 <ext_frc_type         >INTERP_MISSING_MONTHS</ext_frc_type>
 <no2_ext_file         >atm/cam/chem/trop_mozart_aero/emis/chem_gases/2degrees/emissions-cmip6_NO2_aircraft_vertical_1750-2015_1.9x2.5_c20170608.nc </no2_ext_file>
-<so2_ext_file         >atm/cam/chem/trop_mozart_aero/emis/single_forcings/elev/cmip6_mam4_so2_elev_1850-2014_c180205_1850-aero_hist-volcano.nc </so2_ext_file>
+<so2_ext_file         >atm/cam/chem/trop_mozart_aero/emis/DECK_ne30/cmip6_mam4_so2_elev_1850-2014_c180205_1850-aero_hist-volcano.nc </so2_ext_file>
 <soag0_ext_file	      >atm/cam/chem/trop_mozart_aero/emis/single_forcings/elev/emissions-cmip6_e3sm_SOAG0_elev_1850-2014_1.9x2.5_c20230201_1850_repeated_c20241122.nc </soag0_ext_file>
 <bc_a4_ext_file       >atm/cam/chem/trop_mozart_aero/emis/single_forcings/elev/cmip6_mam4_bc_a4_elev_1850-2014_c180205_1850_repeated_c20241122.nc </bc_a4_ext_file>
 <mam7_num_a1_ext_file >atm/cam/chem/trop_mozart_aero/emis/single_forcings/elev/cmip6_mam4_num_a1_elev_1850-2014_c180205_1850_repeated_c20241122.nc </mam7_num_a1_ext_file>