fix: Fix error scene error message in host mode

When using online scene and starting host mode,  users were getting:

```
Closing connection: 0. Received message Mirror.SceneMessage that required authentication
```

Assets/Mirror/Runtime/NetworkManager.cs

@@ -447,7 +447,7 @@ void RegisterClientMessages()
             NetworkClient.RegisterHandler<DisconnectMessage>(OnClientDisconnectInternal, false);
             NetworkClient.RegisterHandler<NotReadyMessage>(OnClientNotReadyMessageInternal);
             NetworkClient.RegisterHandler<ErrorMessage>(OnClientErrorInternal, false);
-            NetworkClient.RegisterHandler<SceneMessage>(OnClientSceneInternal);
+            NetworkClient.RegisterHandler<SceneMessage>(OnClientSceneInternal, false);
 
             if (playerPrefab != null)
             {