small refactor to some stuff

quality_increase no longer passed to microwave_act because it's defined in obj/machinery/microwave

deepfryer code uses adjust_food_quality in a place where it didn't before

code/modules/food_and_drinks/food/snacks.dm

@@ -297,7 +297,7 @@ All foods are distributed among various categories. Use common sense.
 			else
 				S.reagents.add_reagent(r_id, amount)
 
-/obj/item/reagent_containers/food/snacks/microwave_act(obj/machinery/microwave/M, var/quality_increase)
+/obj/item/reagent_containers/food/snacks/microwave_act(obj/machinery/microwave/M)
 	var/turf/T = get_turf(src)
 	var/obj/item/result
 	if(cooked_type)
@@ -305,7 +305,7 @@ All foods are distributed among various categories. Use common sense.
 		//if the result is food, set its food quality to the original food item's quality
 		if(isfood(result))
 			var/obj/item/reagent_containers/food/food_output = result
-			food_output.adjust_food_quality(food_quality + quality_increase)
+			food_output.adjust_food_quality(food_quality + M.quality_increase)
 		if(istype(M))
 			initialize_cooked_food(result, M.efficiency)
 		else

code/modules/food_and_drinks/kitchen_machinery/deep_fryer.dm

@@ -109,7 +109,7 @@ God bless America.
 				var/obj/item/reagent_containers/food/original_food = I
 				frying.adjust_food_quality(original_food.food_quality) //food quality remains unchanged until degree of frying is calculated
 			else
-				frying.food_quality = 10 //inedible fried item has low quality
+				frying.adjust_food_quality(10) //inedible fried item has low quality
 			icon_state = "fryer_on"
 			fry_loop.start()
 

code/modules/food_and_drinks/kitchen_machinery/microwave.dm

@@ -310,7 +310,7 @@
 
 	var/metal = 0
 	for(var/obj/item/O in ingredients)
-		O.microwave_act(src, quality_increase)
+		O.microwave_act(src)
 		if(O.custom_materials?.len)
 			metal += O.custom_materials[SSmaterials.GetMaterialRef(/datum/material/iron)]