Fix for lockboxes spawning with an open icon (#91295)

## About The Pull Request

Title

## Why It's Good For The Game

Because not intended I think

## Changelog

🆑
fix: Lockboxes now correctly use the closed icon_state when first
spawned
/🆑

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

@@ -21,6 +21,7 @@
 	. = ..()
 
 	register_context()
+	update_icon_state()
 
 ///screentips for lockboxes
 /obj/item/storage/lockbox/add_context(atom/source, list/context, obj/item/held_item, mob/user)