Fix #6598: Do not disconnect before company number validation

NetworkClientConnectGame already does a NetworkDisconnect, so no reason to do it here

src/console_cmds.cpp

@@ -914,7 +914,6 @@ DEF_CONSOLE_CMD(ConNetworkConnect)
 	}
 
 	if (argc < 2) return false;
-	if (_networking) NetworkDisconnect(); // we are in network-mode, first close it!
 
 	return NetworkClientConnectGame(argv[1], COMPANY_NEW_COMPANY);
 }