Remove ndjson uuid from tiled.ipynb

Author: Val Brodsky

examples/annotation_import/tiled.ipynb

@@ -997,7 +997,6 @@
         "                    polygon_annotation_two_ndjson\n",
         "                    ]:\n",
         "  annotations.update({\n",
-        "      'uuid' : str(uuid.uuid4()),\n",
         "      'dataRow': {\n",
         "          'id':  next(dataset.export_data_rows()).uid\n",
         "      }\n",