RTL: Don't flip thumbnail positions in Insert Media window.

Restores pre-3.8 behavior.

props siobhyb for the initial patch.
fixes #26461.

git-svn-id: https://develop.svn.wordpress.org/trunk@26748 602fd350-edb4-49c9-b593-d223f7449a82

src/wp-includes/css/media-views.css

@@ -700,11 +700,13 @@
 	overflow: hidden;
 }
 
+/* @noflip */
 .attachment .thumbnail img {
 	top: 0;
 	left: 0;
 }
 
+/* @noflip */
 .attachment .thumbnail .centered {
 	position: absolute;
 	top: 0;