add connection to direct top node (0;1;0) in rules_alldir of homedecor_lightning/init.lua

This allows the rope_light_on_ceiling node to be connected with mesecon in a natural manner.

homedecor_lighting/init.lua

@@ -40,6 +40,7 @@ local rules_alldir = {
 	{x =  0, y =  1, z = -1},
 	{x =  0, y = -1, z = -1},
 	{x =  0, y = -1, z =  0},
+	{x =  0, y =  1, z =  0}
 }
 
 -- mesecons compatibility