Fix temporary external package path for Hera

The path to the temporary location for obsproc, prepobs, etc (`$BASE_GIT`)
was incorrect.

Refs: NOAA-EMC#761

workflow/hosts/hera.yaml

@@ -1,5 +1,5 @@
 # BASE_GIT: '/scratch1/NCEPDEV/global/glopara/git'
-BASE_GIT: '/scratch2/NCEPDEV/ensemble/Walter.Kolczynski/save/gw_external_git'
+BASE_GIT: '/scratch2/NCEPDEV/ensemble/save/Walter.Kolczynski/gw_external_git'
 DMPDIR: '/scratch1/NCEPDEV/global/glopara/dump'
 PACKAGEROOT: '/scratch1/NCEPDEV/global/glopara/nwpara'
 COMROOT: '/scratch1/NCEPDEV/global/glopara/com'