added .control-label check under .control-group

Created by: BigBlueHat

This fix enables <ul> and <ol> structured form layouts. For example:

<fieldset>
  <ul class="control-group">
    <li>
      <label class="control-label" for="add-server-hostname">Server IP Address*:</label>
      <div class="controls">
        <input type="text" />
      </div>
    </li>
  </ul>
</fieldset>