Add missing groups to pine sapling

mods/default/nodes.lua

@@ -1514,7 +1514,7 @@ minetest.register_node("default:pine_sapling", {
 	wield_image = "default_pine_sapling.png",
 	paramtype = "light",
 	walkable = false,
-	groups = {snappy=2,dig_immediate=3},
+	groups = {snappy=2,dig_immediate=3,flammable=2,attached_node=1},
 	sounds = default.node_sound_defaults(),
 })