[w3c/FileAPI] Missing close call on blob-get-stream causes the stream to never finish reading (Issue #206)

I believe [blog get stream](https://w3c.github.io/FileAPI/#blob-get-stream) algorithm is missing a call to [close](https://streams.spec.whatwg.org/#readablestream-close) that stream, which results in consumers of that readable stream never 'finishing' reading that stream.

For example, without a call to "close", from my reading 'done' will never get set to true for the following test:
```js
let buffer = new ArrayBuffer(200);
let bytesReceived = 0;
let offset = 0;

let blob = new Blob(['Data to be read! 🦬']);

const stream = blob.stream();
const reader = stream.getReader({ mode: "byob" });

while (true) {
  let result = await reader.read(new type(buffer, offset, buffer.byteLength - offset));

  if (result.done) {
    return;
  }

  buffer = result.value.buffer;
  offset += result.value.byteLength;
  bytesReceived += result.value.byteLength;
}
```

I think the fix should be just adding a close into the blob-get-stream algorithm after all bytes have been queued into the stream.

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