Removes bulk ammo boxes from webbing storage (#3062)

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## About The Pull Request

Security belts and webbings can no longer store bulk ammo boxes, only
magazines, stripper clips, and speed loaders.

## Why It's Good For The Game

It's a buff to the bandolier ; the more limited storage means bandoliers
can be a better choice for weapons that don't use magazines or have very
small clips, such as most shotguns or loading gate revolvers. Given
bandoliers were designed for that anyway, it only helps push them into
their niche.

## Changelog

:cl:
balance: security belts and webbings can no longer store bulk ammo
boxes, only magazines
/:cl:

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

@@ -270,7 +270,15 @@
 		/obj/item/assembly/flash/handheld,
 		/obj/item/clothing/glasses,
 		/obj/item/ammo_casing/shotgun,
-		/obj/item/ammo_box,
+		/obj/item/ammo_box/magazine,
+		/obj/item/ammo_box/c38, //speed loaders don't have a common path like magazines. pain.
+		/obj/item/ammo_box/a357, //some day we should refactor these into an ammo_box/speedloader type
+		/obj/item/ammo_box/a4570, //but not today
+		/obj/item/ammo_box/a858, //oh boy stripper clips too
+		/obj/item/ammo_box/vickland_a308,
+		/obj/item/ammo_box/a300,
+		/obj/item/ammo_box/aac_300blk_stripper,
+		/obj/item/ammo_box/amagpellet_claris, //that's the last of the clips
 		/obj/item/reagent_containers/food/snacks/donut,
 		/obj/item/kitchen/knife/combat,
 		/obj/item/flashlight/seclite,