The proportions have changed. Compare e.g.: https://news.ycombinator.com/favicon.ico

EDIT: since we're code golfing/bikeshedding, here's my own attempt, which matches the original proportions [1].

    <?xml version="1.0"?>
    <svg xmlns="http://www.w3.org/2000/svg" width="18" height="18" viewBox="0 0 192 192">
      <rect x="4" y="4" width="188" height="188" fill="#f60" stroke="#fff" stroke-width="8"/>
      <path d="m 57,47 h 15 l 24,50 24,-50 h 15 L 102,109 v 40 H 90 v -40 z" fill="#fff"/>
    </svg>

[1] Actually, the original is slightly asymmetric -- the right leg is slightly narrower. I've "corrected" this, making the right leg mirror the left.