Change: [Network] Update server's NetworkServerGameInfo only when needed

Split the updating in a "static" version that only needs to be called when a new map is loaded or some settings are changed, and a "dynamic" version that updates everything that changes regularly such as the current game date or the number of spectators.

src/network/network.cpp

@@ -805,6 +805,7 @@ static void NetworkInitGameInfo()
 		strecpy(_settings_client.network.server_name, "Unnamed Server", lastof(_settings_client.network.server_name));
 	}
 
+	FillStaticNetworkServerGameInfo();
 	/* The server is a client too */
 	_network_game_info.clients_on = _network_dedicated ? 0 : 1;