message: fix(ui): Quick Fix for app_icon
diff: rel="{{favicon.rel if favicon.rel else "icon"}}"
  type="{{favicon.type if favicon.type else "image/png"}}"
  {% if favicon.sizes %}sizes={{favicon.sizes}}{% endif %}
  - href="{{ assets_prefix }}{{favicon.href}}"
  + href="{{ "" if favicon.href.startswith("http") else assets_prefix }}{{favicon.href}}"
  >
  {% endfor %}
  <link rel="stylesheet" type="text/css" href="{{ assets_prefix }}/static/appbuilder/css/flags/flags16.css" />
  