MDL-77347 mod_bigbluebuttonbn: Added missing class properties.

In PHP 8.2 and later, setting a value to an undeclared class property is
deprecated and emits a deprecation notice.
So we need to add missing class properties that still need to be declared.

mod/bigbluebuttonbn/classes/form/text_with_copy_element.php

@@ -32,6 +32,10 @@ require_once("$CFG->libdir/form/text.php");
  * @author     Laurent David  (laurent [at] call-learning [dt] fr)
  */
 class text_with_copy_element extends MoodleQuickForm_text {
+
+    /** @var string an element template. */
+    public $_groupElementTemplate;
+
     /**
      * Accepts a renderer
      *

mod/bigbluebuttonbn/classes/output/instance_updated_message.php

@@ -45,6 +45,9 @@ class instance_updated_message implements renderable, templatable {
      */
     protected $instance;
 
+    /** @var int activity type. */
+    protected $type;
+
     /**
      * Instance updated constructor
      *

mod/bigbluebuttonbn/classes/recording.php

@@ -81,6 +81,9 @@ class recording extends persistent {
     /** @var instance A cached copy of the instance */
     protected $instance;
 
+    /** @var bool imported recording status */
+    public $imported;
+
     /**
      * Create an instance of this class.
      *