Knife visibility quick fix (#3079)

<!-- Write **BELOW** The Headers and **ABOVE** The comments else it may
not be viewable. -->
<!-- You can view Contributing.MD for a detailed description of the pull
request process. -->

## About The Pull Request
oops

These really need Real world icons but I'm not in my active phase rn 
<!-- Describe The Pull Request. Please be sure every change is
documented or this can delay review and even discourage maintainers from
merging your PR! -->

## Why It's Good For The Game
It makes knives appear
<!-- Please add a short description of why you think these changes would
benefit the game. If you can't justify it in words, it might not be
worth adding. -->

## Changelog

:cl:
fix: combat knives and their subtypes now once again have sprites.
/:cl:

<!-- Both :cl:'s are required for the changelog to work! You can put
your name to the right of the first :cl: if you want to overwrite your
GitHub username as author ingame. -->
<!-- You can use multiple of the same prefix (they're only used for the
icon ingame) and delete the unneeded ones. Despite some of the tags,
changelogs should generally represent how a player might be affected by
the changes rather than a summary of the PR's contents. -->

code/game/objects/items/kitchen.dm

@@ -191,7 +191,7 @@
 
 /obj/item/kitchen/knife/combat/Initialize()
 	. = ..()
-	AddElement(/datum/element/world_icon, null, icon, 'icons/obj/kitchen.dmi')
+	AddElement(/datum/element/world_icon, null, icon, 'icons/obj/item/knife.dmi')
 
 /obj/item/kitchen/knife/combat/survival
 	name = "survival knife"