Customize: Draw attention to save button after collapsing the publish settings...

Customize: Draw attention to save button after collapsing the publish settings section when the changeset status or date had been changed.

Props bpayton, westonruter.
See #42114, #39896.
Fixes #42211.

Built from https://develop.svn.wordpress.org/trunk@41932


git-svn-id: https://core.svn.wordpress.org/trunk@41766 1a063a9b-81f0-0310-95a4-ce76da25c4cd