ports /tg/station vis_flags related fixes (#12064)

* fixes

* Update layers_planes.dm

* kay

code/game/objects/effects/effects.dm

@@ -7,7 +7,7 @@
 	move_resist = INFINITY
 	obj_flags = 0
 
-	vis_flags = NONE
+	vis_flags = VIS_INHERIT_PLANE
 
 /obj/effect/take_damage(damage_amount, damage_type = BRUTE, damage_flag = 0, sound_effect = 1, attack_dir)
 	return

code/game/objects/effects/overlays.dm

@@ -49,5 +49,6 @@
 /obj/effect/overlay/vis
 	mouse_opacity = MOUSE_OPACITY_TRANSPARENT
 	anchored = TRUE
+	vis_flags = NONE
 	var/unused = 0 //When detected to be unused it gets set to world.time, after a while it gets removed
 	var/cache_expiration = 2 MINUTES // overlays which go unused for 2 minutes get cleaned up

code/game/objects/objs.dm

@@ -3,6 +3,7 @@
 	var/crit_fail = FALSE
 	animate_movement = 2
 	speech_span = SPAN_ROBOT
+	vis_flags = VIS_INHERIT_PLANE //when this be added to vis_contents of something it inherit something.plane, important for visualisation of obj in openspace.
 	var/obj_flags = CAN_BE_HIT
 	var/set_obj_flags // ONLY FOR MAPPING: Sets flags from a string list, handled in Initialize. Usage: set_obj_flags = "EMAGGED;!CAN_BE_HIT" to set EMAGGED and clear CAN_BE_HIT.