fix: improve brotliDecompress: Uncaught (in promise) ReferenceError: callback is not defined

[philipp-classen]

Fixes: Uncaught (in promise) ReferenceError: callback is not defined

Test program that should then pass:

import zlib from 'node:zlib';
import { promisify } from 'node:util';
import { Buffer } from 'node:buffer';
const brotliDecompress = promisify(zlib.brotliDecompress);

(async () => {
  const result = await brotliDecompress(Buffer.from([0x21, 0x0c, 0x00, 0x04, 0x74, 0x65, 0x73, 0x74, 0x03]));
  console.log(result.toString()); // should print "test"
})();

It now matches the signature in https://nodejs.org/api/zlib.html#zlibbrotlidecompressbuffer-options-callback

The implementation is still incomplete, because the options are ignored. But it should still get it closer to the reference implementation (Node.js).

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