remove question mark in url

Created by: sunilpawar

under function cividiscount_civicrm_navigationMenu https://github.com/dlobo/org.civicrm.module.cividiscount/blob/master/cividiscount.php#L1148 remove "?" mark in the url, it break for unclean url 'url' => 'civicrm/cividiscount?reset=1', TO 'url' => 'civicrm/cividiscount',