Fix assertion in `TestCheckParseValues::test_warns_bad_type` (#894) #700

Job	Run time
simple-checks	10s
unit-tests (py3mypy, tox.ini)	17s
unit-tests (py3, tox.ini)	28s
integration-tests (py3-generic, tox-integration.ini)	1m 57s
integration-tests (py3-mqtt, tox-integration.ini)	4m 6s
integration-tests (py3-hooks, tox-integration.ini)	1m 21s
integration-tests (py3-advanced, tox-integration.ini)	1m 30s
	9m 49s

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