Updated mediawiki/extensions
Project: mediawiki/extensions/Math  28efa34ffd4d613224e9e2c6f6e963625be5eacc

Convert MathJax enabler script to tabs

Per our coding conventions:
https://www.mediawiki.org/wiki/Manual:Coding_conventions/JavaScript

Change-Id: I679246089ec485678088ff08f3a46d8b74a262c5