Allowed page includes on custom home

For #2279
Old hold-over for when include content permissions were handled less
delicately.

app/Entities/Tools/PageContent.php

@@ -316,6 +316,7 @@ class PageContent
             }
 
             // Find page and skip this if page not found
+            /** @var ?Page $matchedPage */
             $matchedPage = Page::visible()->find($pageId);
             if ($matchedPage === null) {
                 $html = str_replace($fullMatch, '', $html);