Updated mediawiki/extensions
Project: mediawiki/extensions/OAuth  3b346a7fd6643f271f4852d7bae30807e938d658

Simplify Multi-wiki setups

* Only allow the OAuth handshake to occure on the central wiki. This
could be changed in the future, but simplifies the logic for now.
* Add check during handshake to ensure central wiki user is valid
* Fix error message display for /authorize phase

Change-Id: I8d482961d58251e931d5454533537b8e719e8357