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[CI] write out tmp files for wav-diff in 24bit format

Jan Kienerequested to merge
ci/24bit-wavs-for-wavdiff into main

Reason why this change is needed

  • temporary wav files written out for wav-diff in the BASOP regression testing can be clipping when written to 16bit pcm wav files. this skews the MLD result heavily

Description of the change

  • use 24bit wav files instead. The additional headroom is enough to accommodate for the inverse scale factor of 3.something in the -10dB testcases

Affected operating points

  • None, script only change
  • CI results for BASOP regression tests should get more accurate

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