Fix game loading lobbies not being shown because of missing map hash arg (#872)

Author: Metadorius

DXMainClient/DXGUI/Multiplayer/CnCNet/CnCNetGameLoadingLobby.cs

@@ -717,6 +717,8 @@ private void BroadcastGame()
             sb.Append(0); // LoadedGameId
             sb.Append(";");
             sb.Append(ClientConfiguration.Instance.DefaultSkillLevelIndex); // we don't know the original skill level
+            sb.Append(";");
+            sb.Append(string.Empty); // MapHash
 
             broadcastChannel.SendCTCPMessage(sb.ToString(), QueuedMessageType.SYSTEM_MESSAGE, 20);
         }

DXMainClient/DXGUI/Multiplayer/LANGameLoadingLobby.cs

@@ -668,6 +668,7 @@ private void BroadcastGame()
             sb.Append(sbPlayers.ToString());
             sb.Append(Convert.ToInt32(started || Players.Count == SGPlayers.Count));
             sb.Append(1); // IsLoadedGame
+            sb.Append(string.Empty); // MapHash
 
             GameBroadcast?.Invoke(this, new GameBroadcastEventArgs(sb.ToString()));
         }