Updated mediawiki/extensions
Project: mediawiki/extensions/MultimediaViewer  4e29e6cd0122396269d3d6deaba4a7197ee6e74d

Fix fileLink initialisation

I guess this got torn out along the way, but I'm pretty sure this is
what I meant to do - initialize the image object with the thumbnail
URL and then replace it later.

+tests for the failure.

Change-Id: I20ef4e87c6b4b6706ad586f2aa5796736895c780