[whatwg/dom] Event::ComposedPath doesn't handle `this.currentTarget == null` (Issue #1343)

### What is the issue with the DOM Standard?

Steps 4 and 5 of [Event::composedPath](https://dom.spec.whatwg.org/#dom-event-composedpath) say to
```
4. Let currentTarget be this’s currentTarget attribute value.
5. Append currentTarget to composedPath.
```
`composedPath` is a `sequence<EventTarget>`, but `currentTarget` is a `EventTarget?`, per the [Event idl interface](https://dom.spec.whatwg.org/#interface-event)

It is unclear to me what should happen when `currentTarget` is `null`.

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