Fixed position of new cog icon in admin changelist relative to text

git-svn-id: http://code.djangoproject.com/svn/django/trunk@16317 bcc190cf-cafb-0310-a4f2-bffc1f526a37

django/contrib/admin/media/css/base.css

@@ -338,7 +338,7 @@ table thead th.sorted a span.sortpos {
 }
 
 table thead th.sorted a img {
-   vertical-align: bottom;
+   vertical-align: top;
 }
 
 table thead th.sorted a span.clear {