rpds can now interact with the unwrench upgrade (tgstation#57959)

Adds the functionality to upgrade the RPD by 'slapping' the unwrench upgrade disk with the RPD itself

It doesn't exactly revolutionize gameplay and at most allows engineering cyborg players to at least upgrade their RPD to unwrench saving them a headache and a module slot when doing their thing I suppose

code/game/objects/items/RPD.dm

@@ -259,6 +259,12 @@ GLOBAL_LIST_INIT(transit_tube_recipes, list(
 /obj/item/pipe_dispenser/attack_self(mob/user)
 	ui_interact(user)
 
+/obj/item/pipe_dispenser/pre_attack(atom/target, mob/user, params)
+	if(istype(target, /obj/item/rpd_upgrade/unwrench))
+		install_upgrade(target, user)
+		return TRUE
+	return ..()
+
 /obj/item/pipe_dispenser/attackby(obj/item/W, mob/user, params)
 	if(istype(W, /obj/item/rpd_upgrade))
 		install_upgrade(W, user)