Updated mediawiki/extensions
Project: mediawiki/extensions/MobileFrontend  c9974df0956cc0ed945fff8a87692d85d428ab2b

Hygiene: Rewrite notification.js

This is now used only for toasts. Code reuse FTW!

In the process removed lots of dead CSS and discovered that toasts'
shadow was overriden in an old CSS rule (this made toasts kind of
blurry).

Change-Id: I100649084f69d0503b7bc2fae7c3e22b60205a18