fixes #3821

Closes #3821

Merge request !2685

db/migrations/5.4.17_reset_my_courses_filter_2.php

+<?php
+
+final class ResetMyCoursesFilter2 extends Migration
+{
+    public function description()
+    {
+        return 'Cleanup user-config again';
+    }
+
+    public function up()
+    {
+        $query = "UPDATE `config_values`
+                  SET `value` = ''
+                  WHERE `value` = 'all'
+                    AND `field` = 'MY_COURSES_SELECTED_STGTEIL'";
+        DBManager::get()->exec($query);
+    }
+}