[non-BE] Resolve "CNA too high in ISM DTX" JBM addon

• Related issues: #552 (closed), follow-up on MR !870 (merged)
• Requested reviewers: @vaclav

Reason why this change is needed

• Add missing functionality in JBM path. This was simply an oversight/incompleteness in !870 (merged).

Description of the change

• The CNG fix CR_FIX_ISM_DTX_INFINITE_CNG_ON_TRAILING_SILENCE is now also included for JBM by copying the missing code parts from ivas_dec() into ivas_jbm_dec_tc(). Original purpose of fix: limit noise energy to noise energy of dominant object. See !870 (merged) for details.

Affected operating points

• ISM DTX JBM: CNG parts are possibly affected, noise levels are lowered. Depends on test file.
• Changes only in decoder, encoder not affected.
  1. Produced bitstream is BE compared to previous state.
• non-BE output if the limitation is triggered.