Updated mediawiki/extensions
Project: mediawiki/extensions/MultimediaViewer  f1b9c0c391522a8faad828e8890e38596082aada

Fix dialog class

Missed this small issue - doesn't affect actual behaviour but will make a
confusing cursor display in some instances.

Change-Id: I40c3cf0c9596f40983f090974044bcd6f7d203d3