Fix multi-cargo ship capacity display in autoreplace and available ships windows

src/vehicle_gui.h

@@ -40,10 +40,10 @@ enum VehicleInvalidateWindowData {
 
 /** Extra information about refitted cargo and capacity */
 struct TestedEngineDetails {
-	Money cost;                  ///< Refit cost
-	CargoID cargo;               ///< Cargo type
-	uint capacity;               ///< Cargo capacity
-	uint16_t mail_capacity;      ///< Mail capacity if available
+	Money cost{};                ///< Refit cost
+	CargoID cargo{};             ///< Cargo type
+	uint capacity{};             ///< Cargo capacity
+	uint16_t mail_capacity{};    ///< Mail capacity if available
 	CargoArray all_capacities{}; ///< Capacities for all cargoes
 
 	void FillDefaultCapacities(const Engine *e);