Updated mediawiki/extensions
Project: mediawiki/extensions/MultimediaViewer  cbf6bd7767d5e5f18f4282f157669ce69206be0f

Make sure that the close button is always visible

Change-Id: Ib1bf72d898220442992c5a30d90a9a683d00d110
Mingle: https://wikimedia.mingle.thoughtworks.com/projects/multimedia/cards/81