Ensure that quick edit does not define a publish date if the post status is one of 'draft', 'pending', or 'auto-draft'.
Props uxtremist, SergeyBiryukov, Denis-de-Bernardy, jane, rfischmann, mista-flo, rutviksavsani, oglekler, joedolson.
Fixes#19907.
Built from https://develop.svn.wordpress.org/trunk@56022
git-svn-id: http://core.svn.wordpress.org/trunk@55534 1a063a9b-81f0-0310-95a4-ce76da25c4cd