Pass normalized username to GlobalRenameUserStatus

We were directly taking the special page input which
means it wasn't normalized.

Change-Id: I5b75ecb41e8697f975963729df463225212a54f6
(cherry picked from commit 2eaaa5fbc2e6fd31b0f5d752f83e0fd44d9fb75e)
Merge "Pass normalized username to GlobalRenameUserStatus" into wmf/1.24wmf16