Remove arguments from fixtures

These can't be used, since we fixtures can no longer be called as if
they were functions, so we can simply the code by removing them.

tests/app/test_utils.py

@@ -79,7 +79,6 @@ def _get_notifications_csv(
 def _get_notifications_csv_mock(
     mocker,
     api_user_active,
-    job_id=fake_uuid
 ):
     return mocker.patch(
         'app.notification_api_client.get_notifications_for_service',