Fix display of notification when User password is created/updated (#1…

…6668)

### What does it do?
Corrects conditionals in New Password area of the User form so the new
password dialog notification only shows when the password is
MODX-generated.

### Why is it needed?
See related issue.

### How to test
Create and update users using each password method to verify the dialog
only shows when appropriate.

### Related issue(s)/PR(s)
Resolves #16666

core/src/Revolution/Processors/Security/User/Create.php

@@ -290,8 +290,8 @@ public function sendNotificationEmail() {
      * @return array|string
      */
     public function cleanup() {
-        $passwordNotifyMethod = $this->getProperty('passwordnotifymethod', 's');
-        if (!empty($passwordNotifyMethod) && $passwordNotifyMethod == 's') {
+        $passwordNotifyMethod = $this->getProperty('passwordnotifymethod');
+        if (!empty($passwordNotifyMethod) && $passwordNotifyMethod === 's') {
             return $this->success($this->modx->lexicon('user_created_password_message', [
                 'username' => $this->object->get('username'),
                 'password' => $this->newPassword,