bluez5: reset timers when reassigning followers

Driver timeouts need to be started/stopped when we switch from follower
to driver or vice versa.

The BT sources fail to do this, so fix it. Sinks already do it right.

spa/plugins/bluez5/media-source.c

@@ -276,6 +276,7 @@ static int do_reassign_follower(struct spa_loop *loop,
 	struct impl *this = user_data;
 	struct port *port = &this->port;
 
+	set_timers(this);
 	spa_bt_decode_buffer_recover(&port->buffer);
 	return 0;
 }