Updated mediawiki/extensions
Project: mediawiki/extensions/Math  67fbac7d67cdfd9ab16880103f9b96ddd1232969

Use radio buttons only for math mode selection

While the combination of all redering modes, might
be useful for some power users it will confuse the
average user and makes bug reporting harder.

Therefore, source rendering on the server side is
used when MathJax is enabled on the client side.

Change-Id: I05a20d7c2298115dbf0429db6c107e8132cc15ff