message: Fix examples, no longer Copy
diff: @@ -100,14 +100,14 @@ impl canvas::Program<Message> for Clock {
  let wide_stroke = Stroke {
  width: thin_stroke.width * 3.0,
  - ..thin_stroke
  + ..thin_stroke.clone()
  };
  frame.translate(Vector::new(center.x, center.y));
  frame.with_save(|frame| {
  frame.rotate(hand_rotation(self.now.hour(), 12));
  - frame.stroke(&short_hand, wide_stroke);
  + frame.stroke(&short_hand, wide_stroke.clone());
  });
  frame.with_save(|frame| {
  