In the admin, do not use auto-generated Gravatar images for comment authors.

This makes it easier to recognize Gravatars (or lack thereof) when moderating comments.

props solarissmoke.
fixes #7054.



git-svn-id: https://develop.svn.wordpress.org/trunk@25091 602fd350-edb4-49c9-b593-d223f7449a82

src/wp-admin/includes/comment.php

@@ -148,7 +148,7 @@ function get_pending_comments_num( $post_id ) {
  */
 function floated_admin_avatar( $name ) {
 	global $comment;
-	$avatar = get_avatar( $comment, 32 );
+	$avatar = get_avatar( $comment, 32, 'mystery' );
 	return "$avatar $name";
 }