[whatwg/streams] Should writableStream.abort() reject on already-errored streams? (#900)

As noted in #847, this can lead to lots of redundant `.catch(() => {})`s.

I think it's especially strange that this rejects given that we just resolve with undefined if the stream is already _closed_. If anything that's the case where you failed to abort. If you're already _errored_, then you've basically aborted the stream already.

So I'm inclined to change this. Any thoughts?

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