fixes head loadout (#21014)

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### Asset Licenses
The following assets that **have not** been created by myself are
included in this PR:

| Path | Original Author | License |
| --- | --- | --- |
| icons/example.dmi | ExamplePerson (Example Station) | CC0 |

code/modules/client/preference_setup/loadout/items/head.dm

@@ -1,4 +1,6 @@
-ABSTRACT_TYPE(/datum/gear/head)
+/datum/gear/head
+	display_name = "headwear, circuitry (empty)"
+	path = /obj/item/clothing/head/circuitry
 	sort_category = "Hats and Headwear"
 	slot = slot_head
 
@@ -187,10 +189,6 @@ ABSTRACT_TYPE(/datum/gear/head)
 	iac["IAC beret"] = /obj/item/clothing/head/beret/iac
 	gear_tweaks += new /datum/gear_tweak/path(iac)
 
-/datum/gear/head/circuitry
-	display_name = "headwear, circuitry (empty)"
-	path = /obj/item/clothing/head/circuitry
-
 /datum/gear/head/tcaf
 	display_name = "tcaf hat selection"
 	path = /obj/item/clothing/head/beret/legion

code/modules/client/preference_setup/loadout/items/xeno/human.dm

@@ -117,6 +117,7 @@
 	var/list/hats = list()
 	hats["hat, gat"] = /obj/item/clothing/head/konyang
 	hats["hat, konyanger hachimaki"] = /obj/item/clothing/head/hachimaki
+	gear_tweaks += new /datum/gear_tweak/path(hats)
 
 /datum/gear/head/human/himeo
 	display_name = "himean cap"