Cargo Price Inflation (#21258)

Refactors cargo pricing code to properly adjust prices based on sector
and category (earlier it would multiply the price by each category's
multiplier, leading to prices above intended price point)

---------

Co-authored-by: Ben10083 <Ben10083@users.noreply.github.com>

code/controllers/subsystems/cargo.dm

@@ -102,6 +102,7 @@ SUBSYSTEM_DEF(cargo)
 /datum/controller/subsystem/cargo/proc/load_cargo_suppliers()
 	for(var/singleton/cargo_supplier/S as anything in (GET_SINGLETON_SUBTYPE_LIST(/singleton/cargo_supplier)))
 		log_subsystem_cargo("Loading supplier '[S.name]', with short name '[S.short_name]'.")
+		S.price_modifier = S.get_total_price_coefficient()
 		SScargo.cargo_suppliers[S.short_name] = S
 
 /datum/controller/subsystem/cargo/proc/load_cargo_items()

code/modules/cargo/items/cargo_items.dm

@@ -46,9 +46,17 @@
 /// Sets the item's adjusted_price according to different price modifiers. Returns nothing.
 /singleton/cargo_item/proc/get_adjusted_price()
 	var/return_price = price
+	var/item_category = SScargo.get_category_by_name(category)
+	var/item_supplier = SScargo.get_supplier_by_name(supplier)
+
+	for(var/supplier_name in SScargo.cargo_suppliers)
+		var/singleton/cargo_supplier/cs = SScargo.get_supplier_by_name(supplier_name)
+		if(cs == item_supplier)
+			return_price *= cs.price_modifier
+
 	for(var/category_name in SScargo.cargo_categories)
 		var/singleton/cargo_category/cc = SScargo.get_category_by_name(category_name)
-		if(cc)
+		if(cc == item_category)
 			return_price *= cc.price_modifier
 
 	adjusted_price = return_price