Resolve "ivas_jbm_dec_tc(): remove unused code"

• Related issues: sa4/audio/ivas-basop#2296 (closed)
• Requested reviewers:

Reason why this change is needed

• There is an unused code in function ivas_jbm_dec_tc().
• Changes follow sa4/audio/ivas-basop!2678 (merged).

Description of the change

• Remove unused code in function ivas_jbm_dec_tc()

Affected operating points

• All is BE