Make doors appear in redstone category of creative

mods/ITEMS/mcl_doors/init.lua

@@ -46,6 +46,7 @@ function mcl_doors:register_door(name, def)
 		description = def.description,
 		inventory_image = def.inventory_image,
 		stack_max = 64,
+		groups = { mesecon_conductor_craftable = 1 },
 		on_place = function(itemstack, placer, pointed_thing)
 			if not pointed_thing.type == "node" then
 				return itemstack