Revert "Added gdm"

This reverts commit 190b3b7454.

msvsphere-9.json

@@ -192,9 +192,6 @@
     "gcc": {
       "reason": "Configure option --with-bugurl changed to https://bugs.msvsphere.ru/ instead of http://bugzilla.redhat.com/bugzilla."
     },
-    "gdm": {
-      "reason": "Added domain patch."
-    },
     "gedit": {
       "reason": "Added Russian description for gnome-software."
     },