[CI][scripts] add missing 160kbps rate for combined formats to ivas_modes.json

Archit Tamarapurequested to merge
missing-160kbps-for-combined-formats-ivas-modes-json into main

Reason why this change is needed

  • See issue

Description of the change

  • Add missing values to JSON arrays

Affected operating points

  • Possibly tests; depends on how extensively runIvasCodec.py is relied upon in CI

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