Fixes flashlight lighting direction mismatch when dropped (#22417)

## About PR

Makes it so lighting system recognizes the direction flashlight is
facing when dropped, so it no longer defaults to south

The reasoning behind this method is,


https://github.com/Aurorastation/Aurora.3/blob/38a5988115e33594fcc9e9fafd08d474bbf76967/code/datums/components/overlay_lighting.dm#L503-L509

items don't update their directions when held and carried around, and
`set_dir()` is where the signal is sent which system listens to

also removes an unused var

code/modules/clothing/head/hardhat.dm

@@ -24,6 +24,11 @@
 	drop_sound = 'sound/items/drop/helm.ogg'
 	pickup_sound = 'sound/items/pickup/helm.ogg'
 
+/obj/item/clothing/head/hardhat/dropped(mob/user)
+	. = ..()
+	if(user?.dir)
+		set_dir(user.dir)
+
 /obj/item/clothing/head/hardhat/orange
 	icon_state = "hardhat_orange"
 	item_state = "hardhat_orange"