Updated mediawiki/extensions
Project: mediawiki/extensions/MobileFrontend  a664cb3a43ee957b338ba7b71d83566f8ed8ae95

Don't load mediawiki.ui.button by default in Minerva

We're not ready for them.

Bug: 62347
Change-Id: I2bc3a4e390a75bc59cc4846662487087e2987364