Updated mediawiki/extensions
Project: mediawiki/extensions/Wikibase  479e74b9636d731ca008bb6b450417e47f7b6882

Sanitize global overrides in unit tests

Avoid reinventing the wheel by doing manual backups.

Change-Id: I41c3e8160169d2f7817dec0d1b36b3db2eaa8f3c