Updated mediawiki/extensions
Project: mediawiki/extensions/MultimediaViewer  4c87c93d91b8fccaaf9a9a5f50268f2828aa4dbd

Use chevron for panel opening affordance

replaces the drag image with a chevron and adds CSS classes to
adjust the opacity changes.

Change-Id: I689c7ff3c952f1ec2b8b16258dc44b1ad095f4fa