Updated mediawiki/extensions
Project: mediawiki/extensions/MultimediaViewer  8408c824201843d7583bab455553c2e92c9cc188

Clear registered events on unattach

Bug: 62033
Change-Id: Ic23a182ac2a74864831796ce493a0c51baa4fe8b
Mingle: https://wikimedia.mingle.thoughtworks.com/projects/multimedia/cards/273