starlight optimization (#17932)

* starlight optimization

* better

code/controllers/configuration/entries/general.dm

@@ -581,7 +581,8 @@
 /datum/config_entry/flag/allow_url_links
 	default = TRUE // honestly if I were you i'd leave this one off, only use in dire situations
 
-/datum/config_entry/flag/starlight // Whether space turfs have ambient light or not
+/datum/config_entry/number/starlight // Whether space turfs have ambient light or not and how strong it is.
+	default = 0
 
 // FIXME: Unused
 ///datum/config_entry/str_list/ert_species

code/controllers/subsystems/lighting.dm

@@ -20,11 +20,6 @@ SUBSYSTEM_DEF(lighting)
 
 /datum/controller/subsystem/lighting/Initialize()
 	if(!subsystem_initialized)
-		if (CONFIG_GET(flag/starlight))
-			for(var/area/A in world)
-				if (A.dynamic_lighting == DYNAMIC_LIGHTING_IFSTARLIGHT)
-					A.luminosity = 0
-
 		subsystem_initialized = TRUE
 		create_all_lighting_objects()