Remove event triggering, it is already done by the enrol_user method

lib.php

@@ -80,18 +80,6 @@ class enrol_apply_plugin extends enrol_plugin {
                 $this->sendConfirmMailToTeachers($instance, $data, $applydescription);
                 $this->sendConfirmMailToManagers($instance, $data, $applydescription);
 
-                // Deprecated fixed by Shiro <gigashiro@gmail.com>
-                //add_to_log($instance->courseid, 'course', 'enrol', '../enrol/users.php?id='.$instance->courseid, $instance->courseid); //there should be userid somewhere!
-                $context = context_course::instance($instance->courseid);
-                \core\event\user_enrolment_created::create(
-                    array(
-                        'objectid' => $instance->id,
-                        'courseid' => $instance->courseid, 
-                        'context' => $context, 
-                        'relateduserid' => $USER->id,
-                        'other' => array('enrol' => 'apply')
-                    ))->trigger();
-
                 redirect("$CFG->wwwroot/course/view.php?id=$instance->courseid");
             }
         }