Updated mediawiki/extensions
Project: mediawiki/extensions/InviteSignup  23a9547129d93969a6df1f1158c4d0e3353a5e52

Pass full special page title in title parameter

Looks like the cause for 404:
https://www.mediawiki.org/wiki/Thread:Extension_talk:InviteSignup/404_on_form_submission_after_%22add%22_button_click

Change-Id: I9ba4fd203ee39f27aaab8adef388665f189a0bbf