bugfix: keep rounded avatar images in autocomplete list

src/plugins/sib-mention-autocomplete.js

@@ -83,6 +83,7 @@ converse.plugins.add('sib-mention-autocomplete', {
 
           img.setAttribute('src', dataUri);
           img.setAttribute('width', '32');
+          img.setAttribute('height', '32');
           img.setAttribute('class', 'avatar avatar-autocomplete');
           element.appendChild(img);
         }