Removing unnecessary lines (NVIDIA-NeMo#11408)

Signed-off-by: Nune <ntadevosyan@nvidia.com>

Author: nune-tadevosyan

nemo/collections/asr/data/audio_to_text_dataset.py

@@ -871,7 +871,6 @@ def write_on_batch_end(
                     item["audio_filepath"] = sample.recording.sources[0].source
                 else:
                     item["audio_filepath"] = sample.id
-                item["audio_filepath"] = sample.recording.sources[0].source
                 item["offset"] = sample.start
                 item["duration"] = sample.duration
                 item["text"] = sample.supervisions[0].text or ''