about widget: Fix metadata for avatar (#533)

layouts/partials/widgets/about.html

@@ -11,7 +11,7 @@
       <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>
-      <meta itemprop="image" content="{{ (printf "/img/%s" $.Site.Params.avatar) | absURL }}">
+      <meta itemprop="image" content="{{ (printf "img/%s" $.Site.Params.avatar) | absURL }}">
       {{ end }}
 
       <div class="portrait-title">