Updated mediawiki/extensions
Project: mediawiki/extensions/Wikibase  2d1bb7543f6941f07b1b32d215308eb81c5bfe51

Fix error in RemoveClaimsTest

- RemoveClaimsTest was producing an error in ReferencedUrlFinder
  when it was executed alone or in --group WikibaseAPI
  because of an undefined property

Change-Id: I5f3e4e675ecb83659ca2733ae19ea1222295fc50