Ports new supermatter sprite (#12148)

code/modules/supermatter/supermatter.dm

@@ -47,16 +47,17 @@
 	desc_antag = "Always ahelp before sabotaging the supermatter, as it can potentially ruin the round. Exposing the supermatter to oxygen or vaccuum will cause it to start rapidly heating up.  \
 	Sabotaging the supermatter and making it explode will cause a period of lag as the explosion is processed by the server, as well as irradiating the entire station and causing hallucinations to happen.  \
 	Wearing radiation equipment will protect you from most of the delamination effects sans explosion."
-	icon = 'icons/obj/engine.dmi'
-	icon_state = "darkmatter"
+	icon = 'icons/obj/supermatter.dmi'
+	icon_state = "supermatter"
 	density = TRUE
 	anchored = FALSE
 	light_range = 4
 	light_power = 1
+	layer = ABOVE_ALL_MOB_LAYER
 
 	var/gasefficency = 0.25
 
-	var/base_icon_state = "darkmatter"
+	var/base_icon_state = "supermatter"
 
 	var/last_power
 	var/damage = 0