[FIX] categories: No need to paginate or sort objects being counted, also use the count already returned from list_category_objects, and build the sting earlier (pref to disable this coming next)

git-svn-id: file:///var/local/code.tiki.org/tikisvn/branches/12.x@48174 b456876b-0849-0410-b77d-98878d47e9d5