Hide file links in action=info's 'Number of redirects to this page'

Special:WhatLinksHere gets now passed hideimages=1
if the concerned page is in the File namespace.

A bit of history:
the 'hideimages' parameter has been added to Special:WhatLinksHere
with commit 06ad0d25 (r34267), then removed with commit cdc7e22d
(r34277), and finally added back with 725cb284 (r34320).

Change-Id: I0f358e52c38bb525cee8085ca206118ee276889d
Merge "Hide file links in action=info's 'Number of redirects to this page'"