Revert "don't set is_airgap when using nonairgap_useiso: not a true airgap sy…"

salt/manager/tools/sbin/soup

@@ -206,18 +206,14 @@ check_airgap() {
   else
     nonairgap_useiso=1
   fi
-
-  if [[ "$AIRGAP" == "true" ]]; then
-      is_airgap=0
-    else
-      is_airgap=1
-  fi
-
   # use ISO if its airgap install OR ISOLOC was set with -f <path>
   if [[ "$AIRGAP" == "true" ]] || [[ $nonairgap_useiso -eq 0 ]]; then
+      is_airgap=0
       UPDATE_DIR=/tmp/soagupdate/SecurityOnion
       AGDOCKER=/tmp/soagupdate/docker
       AGREPO=/tmp/soagupdate/minimal/Packages
+  else
+      is_airgap=1
   fi
 }