Add rel= canonical to remove list

Author: koddr

unset_html_head_link.module

@@ -41,7 +41,8 @@ function _remove_header_links(array &$attachments) {
     'drupal:content-translation-add',
     'drupal:content-translation-edit',
     'drupal:content-translation-delete',
-    'shortlink'
+    'shortlink',
+    'canonical'
   ];
   // Unset loop.
   foreach ($attachments['#attached']['html_head_link'] as $key => $value) {