Ensure that pages carrying a manual canonical URL also get their Open Graph set correctly

Author: csswizardry

_includes/head.html

@@ -116,11 +116,12 @@
 
 {% if page.canonical %}
 <link rel=canonical href="{{ page.canonical }}">
+<meta property=og:url content="{{ page.canonical }}">
 {% else %}
 <link rel=canonical href="{{ page.url | replace:'index.html','' | prepend: site.baseurl | prepend: site.url }}">
+<meta property=og:url content="{{ page.url | replace:'index.html','' | prepend: site.baseurl | prepend: site.url }}">
 {% endif %}
 
-<meta property=og:url content="{{ page.url | replace:'index.html','' | prepend: site.baseurl | prepend: site.url }}">
 <meta name=theme-color content=#f43059>
 <link rel=manifest href=/manifest.json>