Merge pull request #31809 from ShizCalev/helper-cleanup

Cleans up some istypes not using helpers

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

@@ -12,7 +12,7 @@
 
 /obj/effect/decal/HandleTurfChange(turf/T)
 	..()
-	if(T == loc && (isspaceturf(T) || isclosedturf(T) || islava(T) || istype(T, /turf/open/water) || istype(T, /turf/open/chasm)))
+	if(T == loc && (isspaceturf(T) || isclosedturf(T) || islava(T) || istype(T, /turf/open/water) || ischasm(T)))
 		qdel(src)
 
 /obj/effect/turf_decal

code/game/objects/items/storage/backpack.dm

@@ -309,7 +309,7 @@
 /obj/item/storage/backpack/satchel/flat/secret/Initialize()
 	. = ..()
 
-	if(isfloorturf(loc) && !istype(loc, /turf/open/floor/plating/))
+	if(isfloorturf(loc) && !isplatingturf(loc))
 		hide(1)
 
 /obj/item/storage/backpack/satchel/flat/secret/hide(intact)