Set mw.config wgFileCanRotate only on Special:Upload instead of
site-wide

UploadWizard also uses wgFileCanRotate and set the variable by
I3c50b56e6a11742cfc1c02d3d8dbeb0c151b0e91 itself.

Change-Id: Iff6a952c8f4f21c0e27bd6b4191f3b0b453eec03