Datepicker: Remove styles specifically for IE5.

(cherry picked from commit 90050c7)

Author: scottgonzalez

themes/base/jquery.ui.datepicker.css

@@ -56,8 +56,6 @@
 
 /* IE6 IFRAME FIX (taken from datepicker 1.5.3 */
 .ui-datepicker-cover {
-    display: none; /*sorry for IE5*/
-    display/**/: block; /*sorry for IE5*/
     position: absolute; /*must have*/
     z-index: -1; /*must have*/
     filter: mask(); /*must have*/