Finishes seperating ZAS logic from CanPass().

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

@@ -143,8 +143,8 @@
 		var/mob/observer/dead/M = src
 		M.manifest(user)
 
-/mob/observer/dead/CanPass(atom/movable/mover, turf/target, height=0, air_group=0)
-	return 1
+/mob/observer/dead/CanPass(atom/movable/mover, turf/target)
+	return TRUE
 /*
 Transfer_mind is there to check if mob is being deleted/not going to have a body.
 Works together with spawning an observer, noted above.

code/modules/mob/living/living_movement.dm

@@ -1,4 +1,4 @@
-/mob/CanPass(atom/movable/mover, turf/target, height, air_group)
+/mob/CanPass(atom/movable/mover, turf/target)
 	if(ismob(mover))
 		var/mob/moving_mob = mover
 		if ((other_mobs && moving_mob.other_mobs))
@@ -9,4 +9,4 @@
 	return (!mover.density || !density || lying)
 
 /mob/CanZASPass(turf/T, is_zone)
-	return TRUE
+	return ATMOS_PASS_YES