pkp/pkp-lib#8333 Replaced CONTEXT_ID_NONE by SITE_CONTEXT_ID

StaticPagesPlugin.php

@@ -149,7 +149,7 @@ public function callbackHandleContent($hookName, $args)
             // Look for a static page with the given path
             $context = $request->getContext();
             $staticPage = $staticPagesDao->getByPath(
-                $context?->getId() ?? Application::CONTEXT_ID_NONE,
+                $context?->getId() ?? Application::SITE_CONTEXT_ID,
                 $path
             );
         }