replace node with media in link widget

node-media.patch

@@ -74,7 +74,7 @@ protected static function getUriAsDisplayableString($uri) {
       // Show the 'entity:' URI as the entity autocomplete would.
       // @todo Support entity types other than 'node'. Will be fixed in
       //    https://www.drupal.org/node/2423093.
-      if ($entity_type == 'node' && $entity = \Drupal::entityTypeManager()->getStorage($entity_type)->load($entity_id)) {
+      if ($entity_type == 'media' && $entity = \Drupal::entityTypeManager()->getStorage($entity_type)->load($entity_id)) {
         $displayable_string = EntityAutocomplete::getEntityLabels([$entity]);
       }
     }
@@ -108,7 +108,7 @@ protected static function getUserEnteredStringAsUri($string) {
     if ($entity_id !== NULL) {
       // @todo Support entity types other than 'node'. Will be fixed in
       //    https://www.drupal.org/node/2423093.
-      $uri = 'entity:node/' . $entity_id;
+      $uri = 'entity:media/' . $entity_id;
     }
     // Detect a schemeless string, map to 'internal:' URI.
     elseif (!empty($string) && parse_url($string, PHP_URL_SCHEME) === NULL) {
@@ -185,7 +185,7 @@ public function formElement(FieldItemListInterface $items, $delta, array $elemen
       $element['uri']['#type'] = 'entity_autocomplete';
       // @todo The user should be able to select an entity type. Will be fixed
       //    in https://www.drupal.org/node/2423093.
-      $element['uri']['#target_type'] = 'node';
+      $element['uri']['#target_type'] = 'media';
       // Disable autocompletion when the first character is '/', '#' or '?'.
       $element['uri']['#attributes']['data-autocomplete-first-character-blacklist'] = '/#?';