Post format image: fix distorted image preview on iPads, see #24046

git-svn-id: http://core.svn.wordpress.org/trunk@24292 1a063a9b-81f0-0310-95a4-ce76da25c4cd
Compress scripts/styles: 3.6-beta3-24293.

git-svn-id: http://core.svn.wordpress.org/trunk@24293 1a063a9b-81f0-0310-95a4-ce76da25c4cd