Accessibility: Remove the title attributes from the old Media UI.

Also, adds better indication and attributes for the required form fields.
Moves some styles to `deprecated-media.css`.

Props andg, afercia.
Fixes #34944.
Built from https://develop.svn.wordpress.org/trunk@36879


git-svn-id: http://core.svn.wordpress.org/trunk@36846 1a063a9b-81f0-0310-95a4-ce76da25c4cd

wp-admin/css/deprecated-media.css

@@ -152,7 +152,8 @@ thead.media-item-info tr {
 	border: 8px solid #fff;
 }
 
-abbr.required {
+abbr.required,
+span.required {
 	text-decoration: none;
 	border: none;
 }
@@ -364,9 +365,14 @@ h4.media-sub-title {
 }
 
 p.media-types {
+	margin: 0;
 	padding: 1em;
 }
 
+p.media-types-required-info {
+	padding-top: 0;
+}
+
 tr.not-image {
 	display: none;
 }