test(rpc-client): test_qr_securejoin_broadcast: Wait for CHATLIST_CHANGED before getting chatlist

Author: iequidoo

deltachat-rpc-client/tests/test_securejoin.py

@@ -140,6 +140,7 @@ def get_broadcast(ac):
         return chat
 
     def wait_for_broadcast_messages(ac):
+        ac.wait_for_event(EventType.CHATLIST_CHANGED)
         chat = get_broadcast(ac)
 
         snapshot = ac.wait_for_incoming_msg().get_snapshot()