Do not include user column on Special:MyUploads

If Special:ListFiles is being filtered to show only a specific
user, then there's not much point showing which user uploaded
the image, as they are all uploaded by the same user.

Bug: 30627
Change-Id: Ibe1be82cb8f3354889051ef00f3c0b9f9ea5180e
Merge "Do not include user column on Special:MyUploads"