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tpl: Use og:updated_time OpenGraph tag on nodes

A previous commit greatly improved the OpenGraph tags generated by
Hugo's internal opengraph template, but there was a minor error in
the fix. Nodes are of type "website" and according to the Facebook
docs they should use og:updated_time.

See: https://github.com/spf13/hugo/pull/2979
See: https://developers.facebook.com/docs/reference/opengraph/object-type/website/

--- a/tpl/tplimpl/template_embedded.go

+++ b/tpl/tplimpl/template_embedded.go

@@ -172,7 +172,7 @@

 {{ else if not .Date.IsZero }}<meta property="article:published_time" content="{{ .Date.Format "2006-01-02T15:04:05-07:00" | safeHTML }}"/>{{ end }}

 {{ if not .Lastmod.IsZero }}<meta property="article:modified_time" content="{{ .Lastmod.Format "2006-01-02T15:04:05-07:00" | safeHTML }}"/>{{ end }}

 {{ else }}

-{{ if not .Date.IsZero }}<meta property="article:modified_time" content="{{ .Date.Format "2006-01-02T15:04:05-07:00" | safeHTML }}"/>{{ end }}

+{{ if not .Date.IsZero }}<meta property="og:updated_time" content="{{ .Date.Format "2006-01-02T15:04:05-07:00" | safeHTML }}"/>{{ end }}

 {{ end }}{{ with .Params.audio }}

 <meta property="og:audio" content="{{ . }}" />{{ end }}{{ with .Params.locale }}

 <meta property="og:locale" content="{{ . }}" />{{ end }}{{ with .Site.Params.title }}