Updated mediawiki/extensions
Project: mediawiki/extensions/MobileFrontend  dd649e28475092eab98c43f9a0a2bc744a0b1bfe

QA: Follow up to  I7dc9b2a9610042479fc3d3d5e3d0b9f36b8eb599

The 2 class selector doesn't work in Firefox so revert to just one
so the test passes!

Change-Id: I2a5ba909a2ff51a2bc356aff42b1795abcdb2b9f