mod_http_oauth2: Remove broken in-CSS templating Because util.interpolation with a "%b{}" pattern only matches the outer brackets, so variables inside them would not work unless the pattern is changed (also considered).

<tr>
  <td colspan="2">
    <script src="https://hcaptcha.com/1/api.js" async defer></script>
    <div class="h-captcha" data-sitekey="{captcha_public_key}"></div>
  </td>
</tr>