Issue #3405184, provide default value for password field

Closes #3405184

src/Feeds/Fetcher/Form/FtpFetcherFeedForm.php

@@ -95,7 +95,7 @@ class FtpFetcherFeedForm extends ExternalPluginFormBase implements ContainerInje
     $form['password'] = [
       '#title' => $this->t('Password'),
       '#type' => 'select',
-      '#default_value' => NULL,
+      '#default_value' => $config['password'] ?? NULL,
       '#description' => $this->t('The FTP password provided by the Key module.'),
       '#options' => $options,
     ];