Restore getUserMemberStatus function to original implementation and fix database queries

course_details.php

@@ -1,4 +1,5 @@
-<?php include_once('header02.php');
+<?php define('HEADER_VARIANT', '02');
+require_once('header.php');
 
 // SQL query to fetch dates for driver training
 $sql = "SELECT course_id, date FROM courses WHERE course_type = 'driver_training'";