Minor wall deconstruction refactor

code/modules/mining/mine_items.dm

@@ -344,7 +344,6 @@
 	desc = "An easily-compressable wall used for temporary shelter."
 	icon = 'icons/turf/walls/survival_pod_walls.dmi'
 	icon_state = "smooth"
-	walltype = "shuttle"
 	smooth = SMOOTH_MORE // To Do: Add in Diagnaol Smooth Support
 	canSmoothWith = list(/turf/simulated/wall/survival, /obj/machinery/door/airlock/survival_pod)
 

code/modules/mob/living/simple_animal/hostile/spaceworms.dm

@@ -154,7 +154,7 @@
 		if(istype(noms, /turf/simulated/wall))
 			W = noms
 			nomDelay *= 2
-			if(W.walltype == "rwall")
+			if(istype(W, /turf/simulated/wall/r_wall))
 				nomDelay *= 2
 		else
 			return