fix mailto link in footer

AKSubmission/templates/AKSubmission/submission_base.html

@@ -10,7 +10,7 @@
 {% block footer_custom %}
     {% if event.contact_email %}
         <h4>
-            <a href="mailto://{{ event.contact_email }}">{% fontawesome_icon "envelope" %} {% trans "Write to organizers of this event for questions and comments" %}</a>
+            <a href="mailto:{{ event.contact_email }}">{% fontawesome_icon "envelope" %} {% trans "Write to organizers of this event for questions and comments" %}</a>
         </h4>
     {% endif %}
 {% endblock %}