[whatwg/fetch] Default value for ByteString in ResponseInit should be removed (#348)

The [Response IDL](https://fetch.spec.whatwg.org/#response-class) has a `ResponseInit` dictionary with a default value for the `statusText` `ByteString`:
```
dictionary ResponseInit {
  unsigned short status = 200;
  ByteString statusText = "OK";
  HeadersInit headers;
};
```
but the [WebIDL definition for ByteString](http://heycam.github.io/webidl/#idl-ByteString) says
> There is no way to represent a constant ByteString value in IDL.

**Conclusion: the default value for ByteString in ResponseInit should be removed.**
[Firefox](https://dxr.mozilla.org/mozilla-central/source/dom/webidl/Response.webidl?q=path%3Aresponse.webidl&redirect_type=single#) is already doing this.

(@jdm helped me figure this out.)

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