Updated mediawiki/extensions
Project: mediawiki/extensions/Math  147ffa230772426eeabc337a129e47ddaf16c6ce

Fix broken unit tests

Unit tests fail because the inner structure of the
SVG image that is gernerated by the Mathoid server
has changed.

Change-Id: I49d3116ee36b0a7a776df75656706d54bf04e961