TinyMCE: change the icon and tooltip for the remove link button in the inline link toolbar.

Props hardeepasrani, ocean90, magicroundabout, iseulde.
Fixes 37278.

git-svn-id: https://develop.svn.wordpress.org/trunk@38891 602fd350-edb4-49c9-b593-d223f7449a82

src/wp-includes/js/tinymce/plugins/wplink/plugin.js

@@ -560,8 +560,8 @@
 		} );
 
 		editor.addButton( 'wp_link_remove', {
-			tooltip: 'Remove',
-			icon: 'dashicon dashicons-no',
+			tooltip: 'Remove link',
+			icon: 'dashicon dashicons-editor-unlink',
 			cmd: 'wp_unlink'
 		} );