Updated mediawiki/extensions
Project: mediawiki/extensions/MobileFrontend  ab6c0fcdb55605d35cfcc8e77a0c3e09c79f0e99

Regression: Fix fixed header emulation on iOS

Part of the problem introduced in 5963efef. Also, use >= to accommodate
for iPad mini (which is 768px wide).

Bug: 62813
Change-Id: I8707b8934d7394221b24119fad210917d41b3f6e