Replace explicit z-level checks with defines

code/modules/admin/verbs/debug.dm

@@ -521,7 +521,7 @@ GLOBAL_PROTECT(LastAdminCalledProc)
 	for(var/area/A in world)
 		if(on_station)
 			var/turf/picked = safepick(get_area_turfs(A.type))
-			if(picked && (picked.z in GLOB.station_z_levels))
+			if(picked && is_station_level(picked.z))
 				if(!(A.type in areas_all) && !is_type_in_typecache(A, station_areas_blacklist))
 					areas_all.Add(A.type)
 		else if(!(A.type in areas_all))