Fix sending money to companies in single-player mode

src/main_gui.cpp

@@ -50,7 +50,7 @@
 void CcGiveMoney(const CommandCost &result, TileIndex tile, uint32 p1, uint32 p2)
 {
 #ifdef ENABLE_NETWORK
-	if (result.Failed() || !_settings_game.economy.give_money) return;
+	if (result.Failed() || !_settings_game.economy.give_money || !_networking) return;
 
 	/* Inform the company of the action of one of its clients (controllers). */
 	char msg[64];