Updated mediawiki/extensions
Project: mediawiki/extensions/VisualEditor  211727a2fd4e5a1d41a3aea2802f9612c5152f67

Add visualeditor-enable-mwmath preference to default user prefs

Stopping a warning for an undefined index created by I28862f3e62f5c.

Change-Id: Ic4ce78c769706332dc399d9b876af01c84845b9b