[bp/r52117][FIX] removing duplicate tiki-user_preferences.php link http://dev.tiki.org/item5366 (while leaving mobile mode 'as is' in 12.x). thanks gezzzan

git-svn-id: file:///var/local/code.tiki.org/tikisvn/branches/12.x@52136 b456876b-0849-0410-b77d-98878d47e9d5