Adds indestructible sandstone wall (#38350)

* adds sandstone

* OKAY FINE KOR

JEEZ

* I am very angry right now

* you don't seem to understand

* Update closed.dm

code/game/turfs/closed.dm

@@ -36,6 +36,14 @@
 	icon = 'icons/turf/shuttleold.dmi'
 	icon_state = "block"
 
+/turf/closed/indestructible/sandstone
+	name = "sandstone wall"
+	desc = "A wall with sandstone plating. Rough."
+	icon = 'icons/turf/walls/sandstone_wall.dmi'
+	icon_state = "sandstone"
+	baseturfs = /turf/closed/indestructible/sandstone
+	smooth = SMOOTH_TRUE
+
 /turf/closed/indestructible/oldshuttle/corner
 	icon_state = "corner"
 
@@ -152,4 +160,4 @@
 	name = "wall"
 	desc = "A wall made out of a strange metal. The squares on it pulse in a predictable pattern."
 	icon = 'icons/turf/walls/hierophant_wall.dmi'
-	icon_state = "wall"
+	icon_state = "wall"