Updated mediawiki/extensions
Project: mediawiki/extensions/MultimediaViewer  31c2b4169fc1bd5bab6bcd529c6cd0d65d4ecb7c

Fix JS error happening when closing "use this file" dialog

Change-Id: I690f473ea17117bed7d30e1a858f6612f57fc33e
Mingle: https://wikimedia.mingle.thoughtworks.com/projects/multimedia/cards/224