update edit button logic to be compatible with Antora 2

Author: mojavelinux

src/partials/toolbar.hbs

@@ -6,7 +6,7 @@
   </ul>
 </div>
 {{else}}
-{{#unless (includes page.origin.url '@')}}
+{{#unless (or page.origin.private (includes page.origin.url '@'))}}
 <div class="tools" role="navigation">
   <ul>
     <li class="tool edit"><a href="{{{page.editUrl}}}" title="Edit Page" target="_blank" rel="noopener">Edit</a></li>