fix(sdk/LobbyClient): actually notify roomObservers

Author: xeruf

sdk/src/server-api/sc/networking/clients/LobbyClient.java

@@ -47,6 +47,7 @@ protected final void onObject(ProtocolPacket message) {
       RoomPacket packet = (RoomPacket) message;
       String roomId = packet.getRoomId();
       RoomMessage data = packet.getData();
+      roomObservers.getOrDefault(roomId, (m) -> {}).accept(data);
       if (data instanceof MementoMessage) {
         onNewState(roomId, ((MementoMessage) data).getState());
       } else if (data instanceof GameResult) {