Update PageResource.php

I believe this was pointed to the wrong model.  The page resource was not showing pages to chose from for the parent page.  Changing to the Post model instead of PostStatus fixes this.

src/Filament/Resources/PageResource.php

@@ -95,7 +95,7 @@ public static function form(Form $form): Form
                         ->label(__('Post Slug')),
 
                     Select::make('parent_id')
-                        ->options(SkyPlugin::get()->getModel('PostStatus')::where('post_type', 'page')->pluck(
+                        ->options(SkyPlugin::get()->getModel('Post')::where('post_type', 'page')->pluck(
                             'title',
                             'id'
                         ))