Clean up mixed spaces/tabs in post-formats.js

git-svn-id: http://core.svn.wordpress.org/trunk@23850 1a063a9b-81f0-0310-95a4-ce76da25c4cd
Defer JS to document ready

git-svn-id: http://core.svn.wordpress.org/trunk@23851 1a063a9b-81f0-0310-95a4-ce76da25c4cd