Add only students.

main/dropbox/dropbox_functions.inc.php

@@ -510,7 +510,13 @@ function display_add_form($dropbox_unid, $viewReceivedCategory, $viewSentCategor
     if (api_get_session_id()) {
         $complete_user_list_for_dropbox = array();
         if (api_get_setting('dropbox_allow_student_to_student') == 'true' || $_user['status'] != STUDENT) {
-            $complete_user_list_for_dropbox = CourseManager :: get_user_list_from_course_code($course_info['code'], api_get_session_id());
+            $complete_user_list_for_dropbox = CourseManager:: get_user_list_from_course_code(
+                $course_info['code'],
+                api_get_session_id(),
+                null,
+                null,
+                0
+            );
         }
 
         $hideCoach = api_get_configuration_value('dropbox_hide_course_coach');