Fix context of opengraph video range

Fixes #4136

Author: drlogout

tpl/tplimpl/template_embedded.go

@@ -205,7 +205,7 @@ func (t *templateHandler) embedTemplates() {
 <meta property="og:audio" content="{{ . }}" />{{ end }}{{ with .Params.locale }}
 <meta property="og:locale" content="{{ . }}" />{{ end }}{{ with .Site.Params.title }}
 <meta property="og:site_name" content="{{ . }}" />{{ end }}{{ with .Params.videos }}
-{{ range .Params.videos }}
+{{ range . }}
   <meta property="og:video" content="{{ . | absURL }}" />
 {{ end }}{{ end }}