Although it's not enforced that fail_json['msg'] should be a string
[1], I think it is pretty strongly implied.
In this case the failure_response['msg'] is sent through as the
fail_json['msg'], and the trailing commas here turn it into a tuple.
It's not clear if this is a typo or intended, but it does cause
problems for callbacks that expect this as a string (e.g. [2]).
Since there seems no point to having these values as a tuple, remove
the trailing commas so they return a string as per everywhere else.
[1] 4c589661c2/lib/ansible/module_utils/basic.py (L2078)
[2] https://review.opendev.org/#/c/696081
