Bug 1814078: Including the PHPMailer SMTP file as well

This is needed if the user has configured the SMTP settings in
Administration -> Configure site -> Email settings

behatnotneeded

Change-Id: I8931b7acb879ae8eec34d253c95825b51af0ab49
Signed-off-by: Robert Lyon <robertl@catalyst.net.nz>
(cherry picked from commit a3ae7446)

htdocs/lib/user.php

@@ -15,8 +15,10 @@ define('MAX_USERNAME_DISPLAY', 30);
 
 require 'phpmailer/src/PHPMailer.php';
 require 'phpmailer/src/Exception.php';
+require 'phpmailer/src/SMTP.php';
 use PHPMailer\PHPMailer\PHPMailer;
 use PHPMailer\PHPMailer\Exception as phpmailerException;
+use PHPMailer\PHPMailer\SMTP;
 /**
  * loads up activity preferences for a given user
  *