Refactor on_reagent_change to pass through the change type

code/game/mecha/equipment/tools/medical_tools.dm

@@ -504,7 +504,7 @@
 		return 1
 	return
 
-/obj/item/mecha_parts/mecha_equipment/medical/syringe_gun/on_reagent_change()
+/obj/item/mecha_parts/mecha_equipment/medical/syringe_gun/on_reagent_change(changetype)
 	..()
 	update_equip_info()
 	return

code/game/mecha/equipment/tools/work_tools.dm

@@ -179,9 +179,6 @@
 /obj/item/mecha_parts/mecha_equipment/extinguisher/get_equip_info()
 	return "[..()] \[[src.reagents.total_volume]\]"
 
-/obj/item/mecha_parts/mecha_equipment/extinguisher/on_reagent_change()
-	return
-
 /obj/item/mecha_parts/mecha_equipment/extinguisher/can_attach(obj/mecha/working/M as obj)
 	if(..())
 		if(istype(M))

code/game/objects/items/devices/scanners.dm

@@ -417,7 +417,7 @@ MASS SPECTROMETER
 	..()
 	create_reagents(5)
 
-/obj/item/device/mass_spectrometer/on_reagent_change()
+/obj/item/device/mass_spectrometer/on_reagent_change(changetype)
 	if(reagents.total_volume)
 		icon_state = initial(icon_state) + "_s"
 	else