Add data about form editor tutorial into store

[MAILPOET-3206]

lib/Settings/UserFlagsController.php

@@ -20,6 +20,7 @@ class UserFlagsController {
     $this->defaults = [
       'last_announcement_seen' => false,
       'editor_tutorial_seen' => false,
+      'form_editor_tutorial_seen' => false,
       'display_new_form_editor_nps_survey' => false,
       'transactional_emails_opt_in_notice_dismissed' => false,
     ];