Updated mediawiki/extensions
Project: mediawiki/extensions/MobileFrontend  a1e73e0ac43f21b7be8bbf49207059d692f5fda8

Hygiene: Remove this.canHide from editor overlays

It's not necessary anymore since Overlay.prototype.show forces hide by
invoking Overlay.prototype.hide with `true` as an argument.

Change-Id: Iffdf654156dc18decbf46f93c0973807d77c4b24