fix missing ownership check on editing yard signs

signs_lib.lua

@@ -233,6 +233,7 @@ minetest.register_node(":signs:sign_yard", {
                 minetest.pos_to_string(pos)
             ))
         end
+		if homedecor_node_is_owned(pos, sender) then return end
         homedecor_update_sign(pos, fields)
     end,
 	on_punch = function(pos, node, puncher)