Apply default user modes just before registration.

Previously, we were applying defaults before the user had completed
registration. This meant that the number of invisible users was
incremented when the user connected, and then the total was incremented
when registration was completed.

Now both counters are updated at the same time. If a user disconnects
prior to registration, +i has not yet been applied so it would not be
decremented.

irc/client.go

@@ -337,7 +337,6 @@ func (server *Server) RunClient(conn IRCConn) {
 	session.idletimer.Initialize(session)
 	session.resetFakelag()
 
-	ApplyUserModeChanges(client, config.Accounts.defaultUserModes, false, nil)
 	if wConn.Secure {
 		client.SetMode(modes.TLS, true)
 	}