Fixes invisible radiation medkits (#2512)

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## About The Pull Request
Had some unused stuff, and incorrect icon states on them to boot.
Removes that
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## Changelog

:cl:
fix: Fixes invisible radiation medkits
/:cl:

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code/game/objects/items/storage/firstaid.dm

@@ -176,14 +176,10 @@
 /obj/item/storage/firstaid/radiation
 	name = "radiation treatment kit"
 	desc = "Used to treat severe radiation poisoning."
-	icon_state = "antitoxin"
-	item_state = "firstaid-toxin"
+	icon_state = "radiation"
+	item_state = "firstaid-ointment" //its yellow
 	damagetype_healed = TOX
 
-/obj/item/storage/firstaid/radiation/Initialize(mapload)
-	. = ..()
-	icon_state = pick("antitoxin","antitoxfirstaid","antitoxfirstaid2")
-
 /obj/item/storage/firstaid/radiation/PopulateContents()
 	if(empty)
 		return