4.6x30mm Ammunition Boxes Are No Longer Invisible (#2859)

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## About The Pull Request
Turns out adding a . in a dmi frame broke it. Who woulda thunk it.
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## Why It's Good For The Game
No more broken sprite.
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## Changelog

:cl: PositiveEntropy
fix: The 4.6x30mm ammunition box is no longer invisible.
/:cl:

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code/modules/projectiles/boxes_magazines/ammo_boxes.dm

@@ -400,7 +400,7 @@
 /obj/item/ammo_box/c46x30mm_box
 	name = "ammo box (4.6x30mm)"
 	desc = "A box of standard 4.6x30mm ammo."
-	icon_state = "4.6x30mmbox"
+	icon_state = "46x30mmbox"
 	ammo_type = /obj/item/ammo_casing/c46x30mm
 	max_ammo = 50