prefer-destructuring rule triggers when mutating `let` binding

[abonander]

When you have the following:

let foo;
// ...
foo = bar.foo;

The prefer-destructuring rule triggers on the last line even though there's no way to actually mutate a let binding with destructuring ({ foo } = bar; is a syntax error).

[ljharb]

({ foo } = bar);

[abonander]

That works, but looks worse than the original IMO. Still, not a problem with the rule itself, so closing.