Open turf update_icon_edge when updating icons

So grass can edge into it.

code/modules/multiz/turf.dm

@@ -72,6 +72,7 @@
 */
 /turf/simulated/open/update_icon()
 	overlays.Cut()
+	update_icon_edge() //VOREStation Add - Get grass into open spaces and whatnot.
 	var/turf/below = GetBelow(src)
 	if(below)
 		var/below_is_open = isopenspace(below)