Destructuring let attribute in <For> component is removed

[bicarlsen]

As mentioned in leptos Issue 3509, the let attribute of a <For> component can be destructured with the let(/* pattern */) syntax, however leptosfmt completely removes this.
i.e.

<For
  each=move || list.get()
  key=|Item { name, .. }| name.clone()
  let(Item { name, value })  // this will be stripped
>

is formatted to

<For
  each=move || list.get()
  key=|Item { name, .. }| name.clone()
  let  // destructured pattern is stripped
>