Correct deprecated use of $config_directories in settings.php
>>> [!note] Migrated issue
<!-- Drupal.org comment -->
<!-- Migrated from issue #3252659. -->
Reported by: [brian-c](https://www.drupal.org/user/1608500)
>>>
<h3 id="summary-problem-motivation">Problem/Motivation</h3>
<p>Per <a href="https://www.drupal.org/node/3018145">https://www.drupal.org/node/3018145</a>, the configuration sync directory is now defined in <code>$settings['config_sync_directory']</code> in <code>settings.php</code>. This deprecation needs to be addressed prior to upgrading to Drupal 9.</p>
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