fixed default avatar filename

src/plainui/jinja2/plainui/components/badge_elements.html

@@ -11,7 +11,7 @@
             {% else %}
                 <img class="card-img-top aspect-ratio-16by9"
                 alt="Thumbnail Badge {{badge_link.badge.name}}"
-                src="{{ static('plainui/img/hub-no-avatar-plattform-active.jpeg') }}"
+                src="{{ static('plainui/img/hub-no-avatar-plattform-active.png') }}"
                 data-holder-rendered="true">
             {% endif %}
         </div>