Run Autoprefixer after [31504].

This removes media queries for Opera < 12 and `-ms-animation`/`@-ms-keyframes` which was never (dev versions excluded) supported by IE.

see #31337.

git-svn-id: https://develop.svn.wordpress.org/trunk@31505 602fd350-edb4-49c9-b593-d223f7449a82

src/wp-includes/css/editor.css

@@ -2129,7 +2129,6 @@ html:lang(he-il) .rtl .quicktags-toolbar input  {
 
 /* HiDPI */
 @media print,
-  (-o-min-device-pixel-ratio: 5/4),
   (-webkit-min-device-pixel-ratio: 1.25),
   (min-resolution: 120dpi) {
 	.wp-media-buttons .add_media span.wp-media-buttons-icon,