about widget: Fix avatar not showing in some cases

layouts/partials/widgets/about.html

@@ -10,7 +10,7 @@
       <div class="portrait" style="background-image: url('https://s.gravatar.com/avatar/{{ md5 $.Site.Params.email }}?s=200');"></div>
       <meta itemprop="image" content="https://s.gravatar.com/avatar/{{ md5 $.Site.Params.email }}?s=200">
       {{ else if $.Site.Params.avatar }}
-      <div class="portrait" style="background-image: url('{{ (printf "img/%s" $.Site.Params.avatar) | relURL }}');"></div>
+      <div class="portrait" style="background-image: url('{{ (printf "img/%s" $.Site.Params.avatar) | absURL }}');"></div>
       <meta itemprop="image" content="{{ (printf "img/%s" $.Site.Params.avatar) | absURL }}">
       {{ end }}