Revert "Set $wgCategoryCollation to 'uca-cs' on cswiki"

We can't run the update collation script in production on wikis of any size right now without scheduling with ops.  Reverting for now and rescheduling.

This reverts commit 29a6fba29dd44b4d6c4bf48a32355a63274ef5a4.

Change-Id: I08f10a79f95e080c2a9f92f8c8f3e6b5a10a1518