Plane adjustments on several low layer objects. (#12286)

code/game/objects/effects/decals/crayon.dm

@@ -3,7 +3,7 @@
 	desc = "Graffiti. Damn kids."
 	icon = 'icons/effects/crayondecal.dmi'
 	icon_state = "rune1"
-	plane = GAME_PLANE //makes the graffiti visible over a wall.
+	plane = ABOVE_WALL_PLANE //makes the graffiti visible over a wall.
 	gender = NEUTER
 	mergeable_decal = FALSE
 	var/do_icon_rotate = TRUE

code/game/objects/effects/decals/decal.dm

@@ -35,6 +35,7 @@
 	icon = 'icons/turf/decals.dmi'
 	icon_state = "warningline"
 	layer = TURF_DECAL_LAYER
+	plane = ABOVE_WALL_PLANE
 
 /obj/effect/turf_decal/Initialize()
 	..()

code/game/objects/effects/landmarks.dm

@@ -469,6 +469,7 @@ INITIALIZE_IMMEDIATE(/obj/effect/landmark/start/new_player)
 /obj/effect/landmark/stationroom
 	var/list/templates = list()
 	layer = BULLET_HOLE_LAYER
+	plane = ABOVE_WALL_PLANE
 
 /obj/effect/landmark/stationroom/New()
 	..()