X Icon in footer widget

Hello at kriesi,
I have used following code for showing some social icons in der footer widget.

<ul class="noLightbox social_bookmarks icon_count_3">
 	<li class="social_bookmarks_x av-social-link-x social_icon_1"><a title="X" href="https://twitter.com/destinatbrand" target="_blank" rel="noopener" aria-hidden="true" data-av_icon="" data-av_iconfont="entypo-fontello"><span class="avia_hidden_link_text">X</span></a></li>
 	<li class="social_bookmarks_linkedin av-social-link-linkedin social_icon_2"><a title="LinkedIn" href="https://www.linkedin.com/company/destination-brand-by-inspektour/" target="_blank" rel="noopener" aria-hidden="true" data-av_icon="" data-av_iconfont="entypo-fontello"><span class="avia_hidden_link_text">LinkedIn</span></a></li>
 	<li class="social_bookmarks_xing av-social-link-xing social_icon_3"><a title="XING" href="https://www.xing.com/pages/inspektourgmbh-tourismus-undregionalentwicklung" target="_blank" rel="noopener" aria-hidden="true" data-av_icon="" data-av_iconfont="entypo-fontello"><span class="avia_hidden_link_text">xing</span></a></li>
</ul>

Despite the fact that I have updated enfold to the latest version the X Icon is still showing the old twitter bird. I guess it is because of the wrong code in data-av_icon=””.

What can I do to get the correct X icon shown?

Thanks.

Best Regards