Restore post format previewing.

props azaozz. fixes #24483

git-svn-id: http://core.svn.wordpress.org/trunk@24414 1a063a9b-81f0-0310-95a4-ce76da25c4cd
Remove post format icons next to header on edit post screen. fixes #24502. see #24452.

git-svn-id: http://core.svn.wordpress.org/trunk@24415 1a063a9b-81f0-0310-95a4-ce76da25c4cd