Removes a broken DB from the Kilo. (#4124)

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## About The Pull Request
Captain's DB wasn't properly replaced in some previous PR, and the old
one wasn't deleted. The fact that Kilo had a DB too much aside, it was
broken and unusable anyways, due to having default ammo set to null.
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## Changelog

:cl:
fix: Removed a broken Double Barrel from the Kilo.
/:cl:

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_maps/shuttles/independent/independent_kilo.dmm

@@ -674,9 +674,6 @@
 	dir = 8
 	},
 /obj/item/storage/box/ammo/a12g_buckshot,
-/obj/item/gun/ballistic/shotgun/doublebarrel/presawn{
-	default_ammo_type = 0
-	},
 /obj/structure/cable/pink{
 	icon_state = "4-10"
 	},