Fixes the Frontiersman Soft Cap (#3581)

## About The Pull Request

Fixes a typo that broke the sprite whenever you took the hat off or
flipped it

## Why It's Good For The Game

Fixes good

## Changelog

:cl:
fix: Fixed a typo in the Frontiersman softcap that made the sprite go
invisible
/:cl:

code/modules/clothing/factions/frontiersmen.dm

@@ -129,7 +129,7 @@
 	name = "frontiersman cap"
 	desc = "An olive-green and grey baseball hat, worn by cargo technicians working under the Frontiersmen. Even they have the rights for a cool cap!"
 	icon_state = "frontiersoft"
-	soft_type = "frontiersmen"
+	soft_type = "frontier"
 	icon = 'icons/obj/clothing/faction/frontiersmen/head.dmi'
 	mob_overlay_icon = 'icons/mob/clothing/faction/frontiersmen/head.dmi'