Updated mediawiki/extensions
Project: mediawiki/extensions/Echo  d3b67e2122d13b3b285f431c35d4cf0ca027ec3e

Change icons to use img tags, allowing easier customization:

* Icon can be defined using a path or a URL
* Extensions don't need custom CSS, but add icon through BeforeCreateEchoEvent
* Sites set their notification icon in LocalSettings.php or equivalent

Bug: 46585
Change-Id: Ifc02b653d07de19229dfb2604305e32f3bd595fe