Bug #286566 --> edit ldap options dialogs are getting transparent backgrounds.

Don't load prefPanels.css which doesn't exist for Thunderbird and does't contain any CSS needed by these dialogs
anyway. Use chrome://messenger/skin instead.

mailnews/addrbook/prefs/resources/content/pref-directory-add.xul

@@ -39,7 +39,7 @@
 
  ***** END LICENSE BLOCK ***** -->
 
-<?xml-stylesheet href="chrome://messenger/skin/prefPanels.css" type="text/css"?>
+<?xml-stylesheet href="chrome://messenger/skin/" type="text/css"?>
 
 <!DOCTYPE dialog SYSTEM "chrome://messenger/locale/addressbook/pref-directory-add.dtd">
 

mailnews/addrbook/prefs/resources/content/pref-editdirectories.xul

@@ -36,7 +36,7 @@
 
  ***** END LICENSE BLOCK ***** -->
 
-<?xml-stylesheet href="chrome://messenger/skin/prefPanels.css" type="text/css"?>
+<?xml-stylesheet href="chrome://messenger/skin/" type="text/css"?>
 
 <!DOCTYPE dialog SYSTEM "chrome://messenger/locale/addressbook/pref-directory.dtd">