Fixes some exploits (#16134)

code/game/objects/items/weapons/RCD.dm

@@ -428,6 +428,8 @@
 	if(iswallturf(A))
 		if(istype(A, /turf/simulated/wall/r_wall) && !canRwall)
 			return FALSE
+		if(istype(A, /turf/simulated/wall/indestructible))
+			return FALSE
 		if(checkResource(5, user))
 			to_chat(user, "Deconstructing Wall...")
 			playsound(loc, 'sound/machines/click.ogg', 50, 1)

code/modules/mining/lavaland/loot/colossus_loot.dm

@@ -156,7 +156,7 @@
 							var/atom/Picked = pick(NewFlora)
 							new Picked(O)
 						continue
-					if(iswallturf(T) && NewTerrainWalls)
+					if(iswallturf(T) && NewTerrainWalls && !istype(T, /turf/simulated/wall/indestructible))
 						T.ChangeTurf(NewTerrainWalls)
 						continue
 				if(istype(Stuff, /obj/structure/chair) && NewTerrainChairs)