Updated mediawiki/extensions
Project: mediawiki/extensions/VisualEditor  0f01f951bb20ac07da489633d26948e9755b783d

Conditionally register oojs and oojs-ui

Only register them if they aren't already registered, so we're compatible
with versions of MW core with and without oojs.

Change-Id: I5dbb480e8330ceaf0531c194b8ef6cc6c65f537e