message: Fix empty message alignment in `todos` example
diff: @@ -438,6 +438,7 @@ fn loading_message() -> Element<'static, Message> {
  fn empty_message(message: &str) -> Element<'static, Message> {
  Container::new(
  Text::new(message)
  + .width(Length::Fill)
  .size(25)
  .horizontal_alignment(HorizontalAlignment::Center)
  .color([0.7, 0.7, 0.7]),
  