samples: hotfix: Update ListDatasets.java (#1904)

* Update ListDatasets.java

* Update ListDatasets.java

Author: nnegrey

automl/snippets/src/main/java/com/example/automl/ListDatasets.java

@@ -48,7 +48,6 @@ static void listDatasets(String projectId) throws IOException {
       ListDatasetsRequest request =
           ListDatasetsRequest.newBuilder()
               .setParent(projectLocation.toString())
-              .setFilter("translation_dataset_metadata:*")
               .build();
 
       // List all the datasets available in the region by applying filter.