fix(*): fix save of firstname and lastname from devices upon enrollment

fix bad management of the name

inc/agent.class.php

@@ -900,7 +900,7 @@ protected function enrollByInvitationToken($input) {
          $user->update([
                'id'        => $userId,
                'firstname' => $firstname,
-               'realname'  => "$firstname $lastname",
+               'realname'  => $lastname,
          ]);
       }