adds a parent level subsystem initialized var (#33456)

code/controllers/subsystem/atoms.dm

@@ -8,7 +8,6 @@ SUBSYSTEM_DEF(atoms)
 	init_order = INIT_ORDER_ATOMS
 	flags = SS_NO_FIRE
 
-	var/initialized = INITIALIZATION_INSSATOMS
 	var/old_initialized
 
 	var/list/late_loaders

code/controllers/subsystem/lighting.dm

@@ -8,8 +8,6 @@ SUBSYSTEM_DEF(lighting)
 	init_order = INIT_ORDER_LIGHTING
 	flags = SS_TICKER
 
-	var/initialized = FALSE
-
 /datum/controller/subsystem/lighting/stat_entry()
 	..("L:[GLOB.lighting_update_lights.len]|C:[GLOB.lighting_update_corners.len]|O:[GLOB.lighting_update_objects.len]")
 

code/controllers/subsystem/overlays.dm

@@ -10,7 +10,6 @@ SUBSYSTEM_DEF(overlays)
 	var/list/stats
 	var/list/overlay_icon_state_caches
 	var/list/overlay_icon_cache
-	var/initialized = FALSE
 
 /datum/controller/subsystem/overlays/PreInit()
 	overlay_icon_state_caches = list()