xmpp.chapril.org-conversejs/src/templates/roster.html

<span class="input-button-group">
    <input style="display: none;" class="roster-filter" placeholder="{{placeholder}}">
    <select style="display: none;" class="filter-type">
        <option value="contacts">{{label_contacts}}</option>
        <option value="groups">{{label_groups}}</option>
    </select>
</span>