Issue #3441615. remove legacy template var (and service call) in main hook_theme

Closes #3441615

navigation.module

@@ -101,7 +101,6 @@ function navigation_theme($existing, $type, $theme, $path) {
       'items' => [],
       'title' => NULL,
       'menu_name' => NULL,
-      'path' => \Drupal::service('extension.list.module')->getPath('navigation'),
     ],
   ];