Update cirrus to fix Special:Random

Picks up this cherry pick:
Fix some Special:Random bugs

1. If a user asked for a random file in a namespace (Special:Random/File
for example), then we'd use the namespace to pick an index but not as a filter.
This caused searches in the main namespace to work ok but not those in, say,
File. They'd get results from User_talk and other crazy stuff.
2. Searches in the File: namespace were picking up results from commons. While
we want searches to pick up results from commons we probably don't want
Special:Random to do it.

Bug: 66643
Change-Id: I4a8e6eb0979584866ff3b9aa3aeddf646544c779
(cherry picked from commit ab32a4b550d8c6c264e0b8be06d87409aa3d449f)