Reporting: Add username column in user session export - refs BT#21794

main/inc/lib/statistics.lib.php

@@ -2117,6 +2117,7 @@ class Statistics
             get_lang('SessionName'),
             get_lang('LastName'),
             get_lang('FirstName'),
+            get_lang('UserName'),
             get_lang('Email'),
             get_lang('EndDate'),
             get_lang('Score'),
@@ -2144,6 +2145,7 @@ class Statistics
                     $session['name'],
                     $studentInfo['lastname'],
                     $studentInfo['firstname'],
+                    $studentInfo['username'],
                     $studentInfo['mail'],
                     $lastConnectionFormatted,
                     $averageScore,