room: use room_id field in json

instead of group, which is not used by the ogserver anymore.

cli/objects/room.py

@@ -79,7 +79,7 @@ class OgRoom():
         if parsed_args.dns:
             payload['dns'] = parsed_args.dns
         if parsed_args.folder:
-            payload['group'] = parsed_args.folder
+            payload['folder_id'] = parsed_args.folder
         if parsed_args.desc:
             payload['location'] = parsed_args.desc
         rest.post('/room/add', payload=payload)