added set credit to zero option

common.php

@@ -231,6 +231,7 @@ elseif ($_GET['page'] == 'taborvezeto' && (isset($_COOKIE['badminton_camp_leader
 }
 
 $smarty->assign('can_logout', $logout);
+$smarty->assign('maxCredit', $sql->single_variable("SELECT setv_int FROM setting_value WHERE setv_setting_set_id = 5"));
 
 //$page = new page();