[BUGFIX] Clear changePasswordReason after password change

Refs #80

Author: derhansen

Classes/Service/FrontendUserService.php

@@ -114,6 +114,7 @@ public function updatePassword(string $newPassword): void
 
         // Unset reason for password change in user session
         $this->getFrontendUser()->setKey('ses', self::SESSION_KEY, null);
+        $this->getFrontendUser()->storeSessionData();
 
         // Destroy all sessions of the user except the current one
         $sessionManager = GeneralUtility::makeInstance(SessionManager::class);