user records ineditable due to logs written to root node

[kitzberger]

With the new login successful/failed logs (see 69c805f) a fe_users record becomes ineditable in the backend for non-admins due to these log records being with pid=0.

When trying to edit a FE user with a state=STATUS_FRONTEND_LOGIN_FAILED log entries:

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Maybe just do this?

    public function log($state, ?User $user = null, array $additionalProperties = []): void
    {
        if (!ConfigurationUtility::isDisableLogActive()) {
            $log = GeneralUtility::makeInstance(Log::class);
            $log->setTitle(LocalizationUtility::translateByState($state));
            $log->setState($state);

            if ($user) {
                $log->setUser($user);
+               $log->setPid($user->getPid());
            }