Fix typo in Special:MIMESearch causing minor part to be ignored.

img_minor_mime was being added to wrong part of query info
array, and thus was being ignored.

Whoops.

Change-Id: I55f45f5ae9621ff1319b34a2aa85cb4bd2c96253
Follow-up: c93baa941a5a56b7
Merge "Fix typo in Special:MIMESearch causing minor part to be ignored."