Just remove these sections from the quote_listbit template:
HTML Code:
<img src="{$stylevar['imgdir_misc']}/quotation-open.png" alt="“" width="60px" height="51px" class="quoteimage openquote" />
<span width="60px" height="51px" class="openquote ieimage"> </span>
HTML Code:
<span width="60px" height="51px" class="closequote ieimage"> </span>
<if condition="!$sidebar">
<img src="{$stylevar['imgdir_misc']}/quotation-close.png" alt="”" width="60px" height="51px" class="quoteimage closequote" />
</if>