Prevent wires from being rotated (#365)

mesecons_wires/init.lua

@@ -213,7 +213,8 @@ local function register_wires()
 			node_box = nodebox,
 			walkable = false,
 			drop = "mesecons:wire_00000000_off",
-			mesecon_wire = true
+			mesecon_wire = true,
+			on_rotate = false,
 		}, {tiles = tiles_off, mesecons = meseconspec_off, groups = groups_off},
 		{tiles = tiles_on, mesecons = meseconspec_on, groups = groups_on})