Updated mediawiki/extensions
Project: mediawiki/extensions/MultimediaViewer  ea778e990f3baa1422c32928b4d7e5df99efd02f

Fix a few fullscreen bugs

Also pull in a change to multilightbox that will make things easier for
fullscreen handling.

Bug: 55489
Change-Id: I2eda8f82df8602a02dcf1c878c5232a8e6490e6a