Revert "12/21 modernizations from TG live"

code/modules/mob/dead/observer/logout.dm

@@ -1,13 +1,6 @@
 /mob/dead/observer/Logout()
 	if (client)
 		client.images -= ghost_darkness_images
-	if(observetarget)
-		if(ismob(observetarget))
-			var/mob/target = observetarget
-			if(target.observers)
-				target.observers -= src
-				UNSETEMPTY(target.observers)
-			observetarget = null
 	..()
 	spawn(0)
 		if(src && !key)	//we've transferred to another mob. This ghost should be deleted.