Updated mediawiki/extensions
Project: mediawiki/extensions/MobileFrontend  cb52f3d4c0f8721f0df937250d254c0ec2966bca

Story 1629: AbuseFilter support in lead photo uploads

In the process move _showHidden to OverlayNew so that it can be reused
for swapping headers in other overlays.

Change-Id: I5e5130c2dd88454800bb57af7be4c2158e45a348