merge constructor of Drupal\Core\Form\ConfigFormBase into

James Glasgowrequested to merge
issue/saml_sp-3446114:3446114-Settings-page-gets-fatal-error-in-a-new-installation into 4.x

Drupal\saml_sp\Form\SamlSpConfig https://www.drupal.org/project/saml_sp/issues/3446114

Closes #3446114

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