Update default paths of hemco_diagn_file and hemco_data_root

Signed-off-by: Lizzie Lundgren <elundgren@seas.harvard.edu>

Author: lizziel

bld/namelist_files/namelist_defaults_cam.xml

@@ -3567,9 +3567,9 @@
 
 <!-- HEMCO: Harmonized Emissions Component -->
 <use_hemco>.false.</use_hemco>
-<hemco_data_root>atm/cam/geoschem/emis/ExtData/HEMCO</hemco_data_root>
+<hemco_data_root>atm/cam/geoschem/ExtData/HEMCO</hemco_data_root>
 <hemco_config_file>atm/cam/hemco/HEMCO_Config.CC.CEDS_AEIC19.NEx.c241122.rc</hemco_config_file>
-<hemco_diagn_file>atm/cam/geoschem/emis/HEMCO_Diagn.3_5_0.c230307.rc</hemco_diagn_file>
+<hemco_diagn_file>atm/cam/hemco/HEMCO_Diagn.3_5_0.c230307.rc</hemco_diagn_file>
 <hemco_emission_year>-1</hemco_emission_year>
 
 <!-- Default emissions grid resolution at 2x2.5 degree: coarser may result in masking artifacts -->