Updated mediawiki/extensions
Project: mediawiki/extensions/Wikibase  6dc8aa1559b1692afa7da36b191160a670694ae5

Fixed link to Special:SetSiteLink in ItemView - again

- this broke in I430dc1f2bde36ee3f8c94ef846a54ebd80fc21f2

Change-Id: If747fc5dbd0ef942598c5d13fdecf34bb3bf09e1