Minor - Fix query adding "session" prefix

Author: jmontoyaa

main/inc/lib/tracking.lib.php

@@ -3696,7 +3696,7 @@ public static function get_sessions_coached_by_user(
             $select
             (
                 SELECT DISTINCT
-                    id,
+                    session.id,
                     name,
                     access_start_date,
                     access_end_date
@@ -5616,7 +5616,6 @@ public static function show_course_detail($user_id, $course_code, $session_id)
                         $html .= Display::tag('td', $position);
                         $html .= Display::tag('td', $best_score);
                         $html .= Display::tag('td', $graph);
-                    //$html .= Display::tag('td', $latest_attempt_url,       array('align'=>'center', 'width'=>'25'));
                     } else {
                         // Exercise configuration NO results
                         $html .= Display::tag('td', $attempts);