Don't call checkPermissions() when building the sitemap for simple pages

Calling `checkPermissions()` outside the page itself is not intended and may cause errors if `readParameters()` has not been called first.

ref https://www.woltlab.com/community/thread/317075-sitemaps-k%C3%B6nnen-in-php-8-4-nicht-mehr-aktualisiert-werden/

Author: BurntimeX

wcfsetup/install/files/lib/system/sitemap/object/SimplePageSitemapObject.class.php

@@ -69,9 +69,6 @@ public function canView(DatabaseObject $object)
             try {
                 // check modules
                 $page->checkModules();
-
-                // check permission
-                $page->checkPermissions();
             } catch (PermissionDeniedException $e) {
                 return false;
             } catch (IllegalLinkException $e) {