When setting the featured image from the dedicated meta box, only show the...

When setting the featured image from the dedicated meta box, only show the featured image section in the media chooser. props koopersmith. fixes #22731

* Less distracting
* Some of these sections won't apply for CPTs without an editor

git-svn-id: https://core.svn.wordpress.org/trunk@23069 1a063a9b-81f0-0310-95a4-ce76da25c4cd