Revert recent change to config.post concerning SENDCOM

- recent commit to develop changed SENDCOM setting in config.post to use prior setting of variable
- when config.base sets SENDCOM=NO then config.post also sets SENDCOM=NO
- the gdaspost job needs SENDCOM=YES to produce all expected files; in particular the idx sflux files
- setting SENDCOM=YES; will review further in future work

Refs: NOAA-EMC#401

parm/config/config.post

@@ -41,6 +41,6 @@ else
 fi
 
 export GRIBVERSION='grib2'
-export SENDCOM=${SENDCOM:-"YES"}
+export SENDCOM="YES"
 
 echo "END: config.post"