Allows you to tuck the nuclear authentication disk (and plushes) into bed. (#55940)

Adds an element, the tuckable element. Objects with this element can be tucked into bed by hitting a bed with it.

You can now make beds by hitting them with a blanket.
You can now tuck plushes into bed.
You can now tuck the disk into bed, too.

code/game/objects/structures/bedsheet_bin.dm

@@ -27,6 +27,7 @@ LINEN BINS
 /obj/item/bedsheet/Initialize(mapload)
 	. = ..()
 	AddComponent(/datum/component/surgery_initiator, null)
+	AddElement(/datum/element/bed_tuckable, 0, 0, 0)
 
 /obj/item/bedsheet/attack_self(mob/user)
 	if(!user.CanReach(src))		//No telekenetic grabbing.