Revert "(bug 46615) updateCollation.php: sanity check the collation before proceeding"

Sorry, forgot that method was not in the base class, and I had only tested with uca based collations. This breaks on uppercase type collations.

This reverts commit 6eb84144df605feb717efc91c84c00eaec62a5f6

Change-Id: Ib7b9597ff842a76185ba5c153922834ffb741237