fix audio classification pipeline fp16 test on cuda (#36359)

* fix audio classification pipeline fp16 test on cuda

Signed-off-by: jiqing-feng <jiqing.feng@intel.com>

* fix format

Signed-off-by: jiqing-feng <jiqing.feng@intel.com>

* add comments

Signed-off-by: jiqing-feng <jiqing.feng@intel.com>

* Update tests/pipelines/test_pipelines_audio_classification.py

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Signed-off-by: jiqing-feng <jiqing.feng@intel.com>
Co-authored-by: Yih-Dar <2521628+ydshieh@users.noreply.github.com>