Add missing argument to isMenuPluginEnabled() call in HmMenuForm submit handler.

src/Form/HmMenuForm.php

@@ -56,7 +56,7 @@ class HmMenuForm extends MenuForm {
    * if the menu hierarchy plugin is enabled.
    */
   protected function submitOverviewForm(array $complete_form, FormStateInterface $form_state) {
-    if (!$this->isMenuPluginEnabled()) {
+    if (!$this->isMenuPluginEnabled($this->entity)) {
       parent::submitOverviewForm($complete_form, $form_state);
     }
   }
@@ -151,4 +151,3 @@ class HmMenuForm extends MenuForm {
     return $this->isEnabled;
   }
 }
-