Fix broken test

Author: DylanRussell

opentelemetry-sdk/tests/shared_internal/test_batch_processor.py

@@ -116,7 +116,7 @@ def test_telemetry_flushed_before_shutdown_and_dropped_after_shutdown(
         assert batch_processor._batch_processor._shutdown is True
 
         # This should not be flushed.
-        batch_processor.emit(telemetry)
+        batch_processor._batch_processor.emit(telemetry)
         exporter.export.assert_called_once()
 
     # pylint: disable=no-self-use