Updated mediawiki/extensions
Project: mediawiki/extensions/MobileFrontend  fa57fdfd71b0c0d60b29141817a9d3101c4ffc0b

Hygiene: Clean up main menu css

The tablet styling just introduces unnecessary complexity and seems
to break animations on wider screens.
Tested in rtl and ltr modes

Change-Id: Id50cc57b79e3f59c8d79cf295a6e7d9abfab8ebe