Basop 2023 cleanup

• Related issues: sa4/audio/ivas-basop#2023 (closed)
• Related BASOP MR: sa4/audio/ivas-basop!2993 (merged)
• Requested reviewers: @janssontoftg

Reason why this change is needed

• Small cleanup

Description of the change

• Cleanup and simplification of the code under FIX_BASOP_2023_TDREND_DISTATT_PRECISION

Affected operating points

• All BE