Updated mediawiki/extensions
Project: mediawiki/extensions/Math  a3015f6e79e7439d7dfb86153be54f6f36a2d2fb

Hide redundant output in the MathML mode.

In the MathML mode, the SVG is always visible and for Gecko the MathML
output is visible too. This commit modifies ext.math.css to hide redundant
output for a given mathematical formula.

Change-Id: I5d48ec4f2a40246567b201e82444e61d408cb3b5