`github/async-preventdefault` should not flag calls before the first `await`

`preventDefault()` works fine before the first `await` in an async function, so this code works as expected, but if currently flagged:

```js
document.querySelector('a').addEventListener('click', e => {
e.preventDefault();
await fetch('/');
});
```

It's only after the first `await`, where `preventDefault` stops working. I suggest the rule to only flag `preventDefault()` after the first `await`.