Fixes some dyed items retaining their original appearance and adds plasmamen helmet dyeing (#27256)

* Fixes dying not changing the color or description of the dyed item, making it appear unchanged when worn.

* adds plasmaman helmet dyeing

code/modules/clothing/spacesuits/plasmamen.dm

@@ -4,6 +4,7 @@
 	desc = "A special containment helmet that allows plasma-based lifeforms to exist safely in an oxygenated environment. It is space-worthy, and may be worn in tandem with other EVA gear."
 	icon_state = "plasmaman-helm"
 	item_state = "plasmaman-helm"
+	base_icon_state = "plasmaman-helm"
 	strip_delay = 80
 	flash_protect = FLASH_PROTECTION_WELDER
 	tint = FLASH_PROTECTION_WELDER
@@ -15,6 +16,9 @@
 	var/smile_color = "#FF0000"
 	var/visor_icon = "envisor"
 	var/smile_state = "envirohelm_smile"
+
+	dyeable = TRUE
+	dyeing_key = DYE_REGISTRY_PLASMAMEN_HELMET
 	actions_types = list(/datum/action/item_action/toggle_helmet_light, /datum/action/item_action/toggle_welding_screen/plasmaman)
 	visor_vars_to_toggle = VISOR_FLASHPROTECT | VISOR_TINT
 	flags_inv = HIDEMASK|HIDEEARS|HIDEEYES|HIDEFACE
@@ -28,6 +32,7 @@
 
 /obj/item/clothing/head/helmet/space/plasmaman/Initialize(mapload)
 	. = ..()
+	base_icon_state = icon_state
 	visor_toggling()
 	update_icon()
 
@@ -51,9 +56,9 @@
 
 /obj/item/clothing/head/helmet/space/plasmaman/update_icon_state()
 	if(!up)
-		icon_state = initial(icon_state)
+		icon_state = base_icon_state
 	else
-		icon_state = "[initial(icon_state)][on ? "-light":""]"
+		icon_state = "[base_icon_state][on ? "-light":""]"
 	item_state = icon_state
 
 /obj/item/clothing/head/helmet/space/plasmaman/update_overlays()