move airlock chamber setup out of lateinit (#29672)

* move airlock chamber setup out of lateinit

* clean up comment

code/modules/mapping/dynamic_airlocks.dm

@@ -23,8 +23,11 @@
 
 /obj/effect/map_effect/dynamic_airlock/Initialize(mapload)
 	..()
+	return INITIALIZE_HINT_LATELOAD
+
+/obj/effect/map_effect/dynamic_airlock/LateInitialize()
+	. = ..()
 
-	. = INITIALIZE_HINT_QDEL
 	// One helper out of all the connected ones will actually set everything up
 	// and qdel all the connected ones so the linker doesn't attempt to do its
 	// thing more than once per zone
@@ -34,6 +37,8 @@
 	var/datum/dynamic_airlock_linker/linker = new()
 	linker.build(src)
 
+	qdel(src)
+
 /obj/effect/map_effect/dynamic_airlock/proc/collect_sibling_item(atom/A)
 	if(is_type_in_list(A, valid_siblings))
 		LAZYADD(sibling_items, A)