Updated mediawiki/extensions
Project: mediawiki/extensions/Wikibase  d740e8ebd6b03d827c79410206e5007899522548

ClaimDifferenceVisualizer code cleanup

I wanted to highlight the actual changes in the snak details but
gave up for now and added a TODO instead.

The CSS change removes a misplaced padding from the diff view.

Change-Id: Ib5c20d2c86b7b8b9cf51d860aa5577e84f92916a