Replace explicit z-level checks with defines

code/game/gamemodes/clock_cult/clock_scriptures/scripture_drivers.dm

@@ -209,7 +209,7 @@
 	quickbind_desc = "Returns you to Reebe."
 
 /datum/clockwork_scripture/abscond/check_special_requirements()
-	if(invoker.z == ZLEVEL_CITYOFCOGS)
+	if(is_reebe(invoker.z))
 		to_chat(invoker, "<span class='danger'>You're already at Reebe.</span>")
 		return
 	return TRUE