Fixed dynamic properties deprecation in PHP 8.2 (h5p#169)

Author: meirzamoodle

h5peditor-file.class.php

@@ -5,7 +5,7 @@
  */
 class H5peditorFile {
   private $result, $field, $interface;
-  public $type, $name, $path, $mime, $size;
+  public $type, $name, $path, $mime, $size, $extension;
 
   /**
    * Constructor. Process data for file uploaded through the editor.

h5peditor.class.php

@@ -51,7 +51,7 @@ class H5peditor {
     'ckeditor/ckeditor.js',
   );
   private $h5p, $storage;
-  public $ajax, $ajaxInterface;
+  public $ajax, $ajaxInterface, $content;
 
   /**
    * Constructor for the core editor library.