Minor - remove variables not used

main/inc/lib/sessionmanager.lib.php

@@ -5058,8 +5058,6 @@ SQL;
                             'id_coach' => $coach_id,
                             'access_start_date' => $dateStart,
                             'access_end_date' => $dateEnd,
-                            'display_start_date' => $dateStart,
-                            'display_end_date' => $dateEnd,
                             'display_start_date' => $displayAccessStartDate,
                             'display_end_date' => $displayAccessEndDate,
                             'coach_access_start_date' => $coachAccessStartDate,

main/lp/learnpath.class.php

@@ -10376,7 +10376,6 @@ class learnpath
      */
     public function get_student_publications()
     {
-        $sessionId = api_get_session_id();
         $return = '<ul class="lp_resource">';
         $return .= '<li class="lp_resource_element">';
         $return .= Display::return_icon('works_new.gif');