message: Remove unused field in `solar_system` example
diff: @@ -75,7 +75,6 @@ impl Application for SolarSystem {
  struct State {
  space_cache: canvas::Cache,
  system_cache: canvas::Cache,
  - cursor_position: Point,
  start: Instant,
  now: Instant,
  stars: Vec<(Point, f32)>,
  @@ -95,7 +94,6 @@ impl State {
  State {
  space_cache: Default::default(),
  system_cache: Default::default(),
  - cursor_position: Point::ORIGIN,
  start: now,
  now,
  stars: Self::generate_stars(width, height),
  