Tests: Fix redirect-to-commons test
Tests: Fix redirect-to-commons test

Depending on the phase of the moon, MW sometimes gives us a single
redirect or a double one, so don't check for the exact file name, just
check that the redirect points to commons.

Pchelolo/restbase,milimetric/restbase,milimetric/restbase,wikimedia/restbase,Pchelolo/restbase,wikimedia/mediawiki-services-restbase,d00rman/restbase,wikimedia/restbase,d00rman/restbase,cscott/restbase,wikimedia/mediawiki-services-restbase,cscott/restbase