Fix syntax error

tests/handlers/test_typing.py

@@ -254,7 +254,7 @@ class TypingNotificationsTestCase(unittest.HomeserverTestCase):
             [call('typing_key', 1, rooms=[ROOM_ID])]
         )
 
-        put_json = self.hs.get_http_client().put_json_with_trailing_slashes_on_404(
+        put_json = self.hs.get_http_client().put_json_with_trailing_slashes_on_404
         put_json.assert_called_once_with(
             "farm",
             path="/_matrix/federation/v1/send/1000000",