[FIX] chosen: Increase .chosen-drop z-index a lot (was appearing behind the map on tiki-user_preferences, needed to be over 1000 so made it 10,000 - too much? ;)

git-svn-id: file:///var/local/code.tiki.org/tikisvn/branches/12.x@48247 b456876b-0849-0410-b77d-98878d47e9d5