Updated mediawiki/extensions
Project: mediawiki/extensions/Wikibase  4bb0f3f57afd810feb9f280ec48191566b0b0a39

Remove unused imports from Repo

Some are not reported by PHPStorm, I found them with a regex.

Change-Id: Ia1cd608ab7bac79585f21a1cd15c0476ad97f3b2