Customize: Prevent drawing attention to save button if status unchanged from...

Customize: Prevent drawing attention to save button if status unchanged from publish; account for changes to status/date when alerting about unsaved changes.

Also fix malformed ESLint directive from [41933].

Amends [41932].
See #39896, #42211.

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git-svn-id: https://core.svn.wordpress.org/trunk@41781 1a063a9b-81f0-0310-95a4-ce76da25c4cd