Media: Restore correct arrow direction in RTL in Attachment Details m…

…odal.

Reverts [29264]. As we now have a build task to replace dashicons for RTL, the CSS rules no longer worked as expected and had the opposite effect.

Props ramiy, SergeyBiryukov.
Merges [45495] to the 5.2 branch.
Fixes #46289.

git-svn-id: https://develop.svn.wordpress.org/branches/5.2@45511 602fd350-edb4-49c9-b593-d223f7449a82

src/wp-admin/css/media.css

@@ -698,13 +698,11 @@ border color while dragging a file over the uploader drop area */
 	color: #000;
 }
 
-.edit-attachment-frame .edit-media-header .left:before,
-.rtl .edit-attachment-frame .edit-media-header .right:before {
+.edit-attachment-frame .edit-media-header .left:before {
 	content: "\f341";
 }
 
-.edit-attachment-frame .edit-media-header .right:before,
-.rtl .edit-attachment-frame .edit-media-header .left:before {
+.edit-attachment-frame .edit-media-header .right:before {
 	content: "\f345";
 }