repository: fix incorrect help

# ogcli delete repo -h
 [...]
     --id [ID]   room id in scopes

this is not the room id, it should be the repo id.

cli/objects/repo.py

@@ -47,7 +47,7 @@ class OgRepo():
         parser.add_argument('--id',
                             nargs='?',
                             required=True,
-                            help='room id in scopes')
+                            help='repo id (list repos using "ogcli list repos")')
         parsed_args = parser.parse_args(args)
         payload = {'id': parsed_args.id}
         rest.post('/repository/delete', payload=payload)