Fix AI status displays to use a list instead of the world list (#1391)

code/modules/mob/living/silicon/ai/death.dm

@@ -25,7 +25,7 @@
 		spawn(10)
 			explosion(src.loc, 3, 6, 12, 15)
 
-	for(var/obj/machinery/ai_status_display/O in world) //change status
+	for(var/obj/machinery/ai_status_display/O in GLOB.ai_status_displays) //change status
 		if(src.key)
 			O.mode = 2
 			if(istype(loc, /obj/item/device/aicard))
@@ -42,4 +42,4 @@
 	if(doomsday_device)
 		doomsday_device.timing = FALSE
 		SSshuttle.clearHostileEnvironment(doomsday_device)
-		qdel(doomsday_device)
+		qdel(doomsday_device)

code/modules/mob/living/silicon/ai/login.dm

@@ -6,7 +6,7 @@
 		client.images += blood
 
 	if(stat != DEAD)
-		for(var/obj/machinery/ai_status_display/O in GLOB.machines) //change status
+		for(var/obj/machinery/ai_status_display/O in GLOB.ai_status_displays) //change status
 			O.mode = 1
 			O.emotion = "Neutral"
 	view_core()

code/modules/mob/living/silicon/ai/logout.dm

@@ -1,5 +1,5 @@
 /mob/living/silicon/ai/Logout()
 	..()
-	for(var/obj/machinery/ai_status_display/O in world) //change status
+	for(var/obj/machinery/ai_status_display/O in GLOB.ai_status_displays) //change status
 		O.mode = 0
 	view_core()