message: Fix retry button on `download_progress` example
diff: @@ -19,8 +19,8 @@ enum Example {
  #[derive(Debug, Clone)]
  pub enum Message {
  - DownloadProgressed(download::Progress),
  Download,
  + DownloadProgressed(download::Progress),
  }
  impl Application for Example {
  @@ -43,7 +43,9 @@ impl Application for Example {
  fn update(&mut self, message: Message) -> Command<Message> {
  match message {
  Message::Download => match self {
  - Example::Idle { .. } | Example::Finished { .. } => {
  + Example::Idle { .. }
  + | Example::Finished { .. }
  + | Example::Errored { .. } => {
  *self = Example::Downloading { progress: 0.0 };
  }
  _ => {}
  