refactor(MasterRunner): simplify condition in check_stopped #2133

Job	Run time
flake8	23s
lint_typecheck_webui	1m 14s
black	16s
mypy	26s
Always - Docker verify, push to tag 'master' if on master	0s
3.12	7m 26s
3.11	7m 6s
3.10	7m 0s
3.9	7m 4s
3.8	6m 57s
PyPI - Publish prerelease on merge commit on master	0s
Tagged - Docker push to tag based on git tag. Also push 'latest' if on master	0s
PyPI - Publish if this is a tagged commit	0s
	37m 52s

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