Logging a spam attempt triggers "Warning: htmlspecialchars() expects parameter 1 to be string, array given in Drupal\Component\Utility\Html::escape() "

Problem/Motivation

When attempting to log a spam form submission, the form_id is missing from the message and the error "Warning: htmlspecialchars() expects parameter 1 to be string, array given in Drupal\Component\Utility\Html::escape() (line 424 of C:\wamp64\www\d8\web\core\lib\Drupal\Component\Utility\Html.php)" is generated.

Steps to reproduce

Enable logging. Use a browser tool to display the feed_me input element, add data to it, and submit it. Observe that the logged message is missing the form_id and the addition

Proposed resolution

In spamicide.module, spamicide_validate calls:

    \Drupal::logger('spamicide')->notice(
      t('%form_id post blocked by Spamicide module: their IP address is "%ipaddress".',
        [
          '%form_id' => $form['form_id'],
          '%ipaddress' => Drupal::request()->getClientIp(),
        ])
    );

$form['form_id'] is a form element. What is intended is $form['#form_id'] which is the string of the form id.

Furthermore, this isn't how messages should be logged. They should not be translated and the placeholders should be passed. The correct call should be (untested):

    \Drupal::logger('spamicide')->notice(
      '%form_id post blocked by Spamicide module: their IP address is "%ipaddress".',
      [
        '%form_id' => $form['#form_id'],
        '%ipaddress' => Drupal::request()->getClientIp(),
      ]
    );