show photo upload on Special:DonateImage (bug 43788)

mf-user-gallery is being prevented from working due to relying on
the supported property of the photos module

The supported property should just say whether the user is allowed to
upload and should not limit the context - the init function for mf-photo
should check this itself

Change-Id: I5bb9d41639e2e4658618f187988405ffc80b2709
Merge "show photo upload on Special:DonateImage (bug 43788)"