Updated mediawiki/extensions
Project: mediawiki/extensions/BlueSpiceFoundation  522a27d3bc2254726f37e829a2b5ae925f85ae62

Added missing query param returnto

Query param returnto was missing on login link, so the user always gets
redircted to main page and not to the desired page.

Change-Id: I1d3c1288a45ab4bab4552b6be06dfa21a5a3ba8a