Double notification when muc_list is in use and nick is mentioned

When running with:

[simple_notify]
command = /usr/bin/notify-send "New message from s" "(body)s"
muc_too = true
muc_list = myconf@example.com

and someone mention my username in myconf@example.com I get notified twice. I'm running version 20160612.ce915a86-1 via ARCHs poezio-git

• Changesets:
  • Revision 79461900 by mathieui on 2016-08-26T19:33:19Z:

Fix #3205 (doubled notification in simple_notify)