Move stylesheet inclusion from the lightning pref pane overlay up one-level to the pref window overlay so that it is applied all the time, not just when that pane is selected; follow-on to fix for bug 305577. No bug. r=jminta@gmail.com

calendar/lightning/content/lightning-preferences.xul

@@ -43,8 +43,6 @@
     <!ENTITY % dtd2 SYSTEM "chrome://calendar/locale/global.dtd" > %dtd2;
 ]>
 
-<?xml-stylesheet href="chrome://lightning/skin/lightning.css"?>
-
 <overlay id="LightningPaneOverlay"
          xmlns="http://www.mozilla.org/keymaster/gatekeeper/there.is.only.xul">
 

calendar/lightning/content/messenger-overlay-preferences.xul

@@ -39,6 +39,8 @@
 
 <!DOCTYPE overlay SYSTEM "chrome://lightning/locale/lightning.dtd" >
 
+<?xml-stylesheet href="chrome://lightning/skin/lightning.css"?>
+
 <overlay xmlns="http://www.mozilla.org/keymaster/gatekeeper/there.is.only.xul">
 
 <prefwindow id="MailPreferences">