Updated mediawiki/extensions
Project: mediawiki/extensions/Wikibase  50662dda934b0c3a6dad2bc0025bd4c7a242b2fc

redirect wb.utilities.inherit to dv.util.inherit

This redundant code should have been removed a while ago when the code moved into the DataValues
extension. Also removed tests since they are in the datavalues extension already.

Change-Id: I3977444dcdd5cac7654a98d7d97652827f035524