Re: [whatwg/url] URL serialiser does not produce idempotent strings if an opaque path has a trailing space and "exclude fragment" is true (Issue #784)

To illustrate using JSDOM:

```javascript
const urlRecord = parseURL("data:space #hello");
const serialized = serializeURL(urlRecord, /* excludeFragment: */ true);
  
const reparsed = parseURL(serialized);
const serializedAgain = serializeURL(reparsed, /* excludeFragment: */ true);
assert.strictEqual(serialized, serializedAgain);  // Fails
```

```
assert.strictEqual(received, expected)

Expected value to strictly be equal to:
  "data:space"
Received:
  "data:space "
```

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