Updated mediawiki/extensions
Project: mediawiki/extensions/SocialLogin  1a61994f31a25ef3aff4e3cd36a57359d3d69fe9

Use session_id() instead of $wgSessionStarted to check for session existence

More reliable check and so that $wgSessionStarted can be removed at some point.

Change-Id: I6541b52d090b0ea3f17c987ed2595d086bd1c3a1