add missing growing group

oranges.lua

@@ -15,6 +15,7 @@ minetest.register_craftitem("farming:orange_item", {
     end
 })
 
+-- orange definition
 local crop_def = {
 	paramtype = "plantlike",
 	walkable = false,
@@ -25,7 +26,7 @@ local crop_def = {
 	drop = "",
 	tiles = {"farming_orange_1.png"},
 	selection_box = farming.select,
-	groups = {snappy=3, flammable=2, not_in_creative_inventory=1,plant=1},
+	groups = {snappy=3, flammable=2, not_in_creative_inventory=1,plant=1,growing=1},
 	sounds = default.node_sound_leaves_defaults(),
 }