Remove the hardcode parent and depth from the url

src/Form/HmOverviewTerms.php

@@ -54,11 +54,11 @@ class HmOverviewTerms extends OverviewTerms {
                 // Get current language.
                 $language = \Drupal::languageManager()->getCurrentLanguage();
                 if ($language->isDefault()) {
-                  $source_url = $base_path . 'admin/hierarchy_manager/taxonomy/json/' . $vid . '?parent=0&depth=1&token=' . $token;
+                  $source_url = $base_path . 'admin/hierarchy_manager/taxonomy/json/' . $vid . '?token=' . $token;
                   $update_url = $base_path . 'admin/hierarchy_manager/taxonomy/update/' . $vid . '?token=' . $token;
                 }
                 else {
-                  $source_url = $base_path . $language->getId() . '/admin/hierarchy_manager/taxonomy/json/' . $vid . '?parent=0&depth=1&token=' . $token;
+                  $source_url = $base_path . $language->getId() . '/admin/hierarchy_manager/taxonomy/json/' . $vid . '?token=' . $token;
                   $update_url = $base_path . $language->getId() . '/admin/hierarchy_manager/taxonomy/update/' . $vid . '?token=' . $token;
                 }
                 return $instance->getForm($source_url, $update_url);