Issue #1496534 follow-up by nadavoid, Lars Toomre: Convert missed...

Issue #1496534 follow-up by nadavoid, Lars Toomre: Convert missed user_mail_status_canceled_notify variable to CMI.

core/modules/user/lib/Drupal/user/Tests/UserCancelTest.php

@@ -393,7 +393,7 @@ function testUserWithoutEmailCancelByAdmin() {
   function testMassUserCancelByAdmin() {
     config('user.settings')->set('cancel_method', 'user_cancel_reassign')->save();
     // Enable account cancellation notification.
-    variable_set('user_mail_status_canceled_notify', TRUE);
+    config('user.settings')->set('notify.status_canceled', TRUE)->save();
 
     // Create administrative user.
     $admin_user = $this->drupalCreateUser(array('administer users'));