Bug 121057 Prefs panel "Advanced|Scripts & Windows" can only be visited once per session

patch by jrgm r=caillon@returnzero.com sr=blake a=brendan

suite/common/pref/pref-scripts.xul

@@ -36,7 +36,6 @@
    - ***** END LICENSE BLOCK ***** -->
 
 <?xml-stylesheet href="chrome://communicator/skin/" type="text/css"?>
-<?xml-stylesheet href="chrome://communicator/skin/dialogOverlay.css" type="text/css"?>
 
 <!DOCTYPE window SYSTEM "chrome://communicator/locale/pref/pref-scripts.dtd" >
 <page id="scriptsAndWindowPanel" xmlns="http://www.mozilla.org/keymaster/gatekeeper/there.is.only.xul"