Properly handle kick from a MUC

When you kick a Matrix Simulacrum from a MUC, it's not reflected on the Matrix side appropriately. Messages written in the MUC after the kick never get delivered to the user.

When the user sends a message, it is dropped, but the user joins into the MUC. Not sure if this was a race condition between XEP-0410 and the message sending, or if your code triggers a XEP-0410 self-ping when sending a message.

<!-- user is kicked from the MUC -->
Feb 15 16:05:03 Sending[s2sout]: <presence type='unavailable' to='somebody_matrix.org@bridge.xmpp.matrix.org/matrix-bridge' from='xmpp@chat.yax.im/somebody'>

<!-- things happen, user writes a message, bifrost tests self-presence according to XEP-0410? -->
Feb 15 16:05:58 Received[s2sin]: <iq id='a2daf467-275f-4ae2-a461-03915f22cf1c' type='get' to='xmpp@chat.yax.im/somebody' from='somebody_matrix.org@bridge.xmpp.matrix.org/matrix-bridge'>
Feb 15 16:05:58 Sending[s2sout]: <iq id='a2daf467-275f-4ae2-a461-03915f22cf1c' type='error' to='somebody_matrix.org@bridge.xmpp.matrix.org/matrix-bridge' from='xmpp@chat.yax.im/somebody'>
Feb 15 16:05:58 Received[s2sin]: <message id='$15502431573634DqrJo:matrix.org' type='groupchat' to='xmpp@chat.yax.im' from='somebody_matrix.org@bridge.xmpp.matrix.org/matrix-bridge'>
Feb 15 16:05:58 Sending[s2sout]: <message id='$15502431573634DqrJo:matrix.org' type='error' to='somebody_matrix.org@bridge.xmpp.matrix.org/matrix-bridge' from='xmpp@chat.yax.im'>
Feb 15 16:05:58 Received[s2sin]: <presence to='xmpp@chat.yax.im/somebody' from='somebody_matrix.org@bridge.xmpp.matrix.org/matrix-bridge'>
Feb 15 16:05:58 mod_muc debug   somebody_matrix.org@bridge.xmpp.matrix.org/matrix-bridge joining as xmpp@chat.yax.im/somebody

Start by tracing the MUC kick handling and the XEP-0410 self-presence sequence described in the issue logs. Reproduce the kick, message, IQ error, and subsequent presence flow; done means the kicked user does not rejoin unexpectedly and messages sent afterward are handled correctly.