Removes Collars from the Cargo Merch Store

Removes them from the merch store, since they can be purchased MUCH
cheaper at the CritterCare vendor. The only advantage to them being here
is not needing to restock and the box you get with it.

code/modules/store/items.dm

@@ -57,12 +57,6 @@
 	typepath = /obj/item/weapon/storage/box/dice
 	cost = 200
 
-/datum/storeitem/collar
-	name = "Pet Collar"
-	desc = "A box containing a pet collar; perfect for claiming a pet as your own personal accessory."
-	typepath = /obj/item/clothing/accessory/petcollar
-	cost = 350
-
 /datum/storeitem/crayons
 	name = "Crayons"
 	desc = "Let security know how they're doing by scrawling lovenotes all over their hallways."