Update prep_mtedx_data.py

[bofenghuang]

Hi, missing unpacked value here :)

cc: @kahne

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[bofenghuang]

Hi again @kahne ,

soundfile.write accepts an array of (T x C), but _wavform here has (C x T). Fixed here in 2nd commit

[bofenghuang]

Hi, is_audio arg has been added to get_zip_manifest for audio/fbanck in the 3rd commit

[bofenghuang]

Close as mentioned in https://github.com/facebookresearch/fairseq/issues/4493