Issue #3509371: Add third parameter to function definition.

src/Plugin/AiCKEditor/WCAG.php

@@ -115,7 +115,7 @@ final class WCAG extends AiCKEditorPluginBase {
   /**
    * {@inheritdoc}
    */
-  public function buildCkEditorModalForm(array $form, FormStateInterface $form_state) {
+  public function buildCkEditorModalForm(array $form, FormStateInterface $form_state, array $settings = []) {
     $storage = $form_state->getStorage();
     $editor_id = $this->requestStack->getParentRequest()->get('editor_id');