Updated mediawiki/extensions
Project: mediawiki/extensions/MultimediaViewer  bfa530cc21b47e2e1ae80c9d64c48aea0259d07e

Wait for CSS to be truly loaded before opening the viewer

This is a workaround for core bug #61852

Change-Id: If7d830866993eddbf5784694514ff89aece56c5b
Mingle: https://wikimedia.mingle.thoughtworks.com/projects/multimedia/cards/258