Merge pull request #51075 from kevinz000/patch-601

Updates dir_inverse_multiz to .. well, work.

code/modules/mapping/space_management/multiz_helpers.dm

@@ -32,16 +32,3 @@
 
 /turf/proc/below()
 	return get_step_multiz(src, DOWN)
-
-/proc/dir_inverse_multiz(dir)
-	var/holder = dir & (UP|DOWN)
-	if((holder == NONE) || (holder == (UP|DOWN)))
-		return turn(dir, 180)
-	dir &= ~(UP|DOWN)
-	dir = turn(dir, 180)
-	if(holder == UP)
-		holder = DOWN
-	else
-		holder = UP
-	dir |= holder
-	return dir