Accessibility: Standardize the remove/delete/cancel links in the Menus screen and Publish meta boxes.

The `submitdelete` CSS class is used in various places across the admin for some
"red" action links. It is worth simplifying this rule for further improvements
related to color contrast.

- simplifies a non-standard styling for the "Remove/Cancel" links in the Menus screen
- underlines all the "Move to trash/Delete" red links in all the Publish meta boxes
- fixes CSS classes usage for all the Publish meta boxes primary buttons
- fixes broken layout for the old Link Manager publish meta box

Props karmatosed, hugobaeta, monikarao, afercia.
Fixes #37969, #37018. See #37448, #37138, #27314.

Built from https://develop.svn.wordpress.org/trunk@38616


git-svn-id: http://core.svn.wordpress.org/trunk@38559 1a063a9b-81f0-0310-95a4-ce76da25c4cd

wp-admin/css/common-rtl.css

@@ -855,7 +855,6 @@ span.required,
 #media-items a.delete-permanently:hover,
 #nav-menu-footer .menu-delete:hover {
 	color: #f00;
-	text-decoration: none;
 	border: none;
 }
 
@@ -875,10 +874,8 @@ span.required,
 }
 
 #delete-action {
-	line-height: 28px;
-	vertical-align: middle;
-	text-align: right;
 	float: right;
+	line-height: 28px;
 }
 
 #publishing-action {