Re: [whatwg/streams] Refactor writable stream erroring to be centralized (#705)

Unfortunately the following very simple test fails with this patch, and was only caught by the transform stream tests, not any writable-stream tests:

```js
const ws = new WritableStream({
  close() {
    throw "x";
  }
});

const writer = ws.getWriter();

writer.write("y");
writer.close();
```

It's again around the ready promise. Debugging help appreciated!

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