Fix missing thermite walls missing their sprites and dionae titles (#2460)

-fix using thermite on walls leaving behind a black title
-fix the dionae titles having no sprite
-adds a bluespace walls that don't spread, for use in future events

code/game/gamemodes/endgame/supermatter_cascade/blob.dm

@@ -117,3 +117,6 @@
 		return
 
 	qdel(user)
+
+/turf/unsimulated/wall/supermatter/no_spread
+	avail_dirs = list()

code/game/turfs/flooring/flooring.dm

@@ -196,4 +196,11 @@ var/list/flooring_types
 	can_paint = 1
 
 /decl/flooring/reinforced/ramp/bottom
-	icon_base = "rampbot"
+	icon_base = "rampbot"
+	
+/decl/flooring/diona
+	name = "biomass"
+	desc = "a mass of small intertwined aliens forming a floor... Creepy."
+	icon = 'icons/turf/floors.dmi'
+	icon_base = "diona"
+	flags = TURF_ACID_IMMUNE | TURF_REMOVE_SHOVEL

code/game/turfs/simulated/floor_types.dm

@@ -5,6 +5,7 @@
 	name = "biomass flooring"
 	icon_state = "diona"
 	footstep_sound = "grassstep"
+	initial_flooring = /decl/flooring/diona
 
 /turf/simulated/floor/diona/attackby()
 	return