Fix: remove ability to buy items from a vendor if they don't sell said item (#1105)

dGame/dComponents/VendorComponent.cpp

@@ -134,3 +134,7 @@ void VendorComponent::SetupConstants() {
 	m_RefreshTimeSeconds = vendorComps[0].refreshTimeSeconds;
 	m_LootMatrixID = vendorComps[0].LootMatrixIndex;
 }
+
+bool VendorComponent::SellsItem(const LOT item) const {
+	return m_Inventory.find(item) != m_Inventory.end();
+}

dGame/dComponents/VendorComponent.h

@@ -67,6 +67,8 @@ public:
 	 * Called on startup of vendor to setup the variables for the component.
 	 */
 	void SetupConstants();
+
+	bool SellsItem(const LOT item) const;
 private:
 	/**
 	 * The buy scalar.