dashboard: fix default user icon display
diff --git a/Allura/allura/ext/personal_dashboard/templates/dashboard_index.html b/Allura/allura/ext/personal_dashboard/templates/dashboard_index.html
index 86919db..ad9bb1b 100644
--- a/Allura/allura/ext/personal_dashboard/templates/dashboard_index.html
+++ b/Allura/allura/ext/personal_dashboard/templates/dashboard_index.html
@@ -33,8 +33,7 @@
 {% endblock %}
 
 {% block nav_menu %}
-    <img src='{{ user.icon_url() }}' alt="{{ user.display_name }}"
-         title="{{ user.display_name }}" class="emboss x48 project_icon">
+    {{lib.gravatar(user, size=48)}}
     <h1 class="project_title">
         {{ user.display_name }} / Dashboard
     </h1>