Updated mediawiki/extensions
Project: mediawiki/extensions/MultimediaViewer  60dc8e9e465bbb572cce1e37b284046a20f87bed

Bring Media Viewer up to date.

Change-Id: I5e2e4aa9a642d5e00bc4b1bcd4d5496141f5eaa8
Mingle: https://wikimedia.mingle.thoughtworks.com/projects/multimedia/cards/796