Fix for smoketest blocker but 134191. Add listbox.css to classic jar file. sr=hewitt.

themes/classic/global/mac/jar.mn

@@ -13,6 +13,7 @@ classic.jar:
   skin/classic/global/globalBindings.xml
   skin/classic/global/groupbox.css
   skin/classic/global/linkTree.css
+  skin/classic/global/listbox.css
   skin/classic/global/menu.css
   skin/classic/global/menulist.css
   skin/classic/global/popup.css