make moss buildable_to

and make sunflower attached_node like other plants

trunks/nodes.lua

@@ -95,6 +95,7 @@ for r = 0, 3 do
 		sunlight_propagates = true,
 		walkable = false,
 		node_box = cbox,
+		buildable_to = true,
 		groups = {snappy = 3, flammable = 3, attached_node=1, not_in_creative_inventory = r},
 		sounds = default.node_sound_leaves_defaults(),
 		drop = "trunks:moss_plain_0",
@@ -114,6 +115,7 @@ for r = 0, 3 do
 		sunlight_propagates = true,
 		walkable = false,
 		node_box = cbox,
+		buildable_to = true,
 		groups = {snappy = 3, flammable = 3, attached_node=1, not_in_creative_inventory = r},
 		sounds = default.node_sound_leaves_defaults(),
 		drop = "trunks:moss_with_fungus_0",