[Regression2553] Energy drop in output (OMASA)
# Basic info
<!--- Add commit SHA used to reproduce -->
- Fixed point:
- Encoder (fixed): 4b190e6f2f481c49000ce8fde30df66302362680
- Decoder (fixed):
# Bug description
The BASOP waveform at channel 2, decays to near-zero ~20 ms earlier than the float reference.
{width=900 height=507}
# Ways to reproduce
<!-- Commandline or script -->
_+10dB testcase_
```bash
IVAS_cod -ism_masa 4 1 scripts/testv/ltv48_OMASA_1ISM_1TC_ISM1.csv scripts/testv/ltv48_OMASA_2ISM_1TC_ISM2.csv scripts/testv/ltv48_OMASA_3ISM_1TC_ISM3.csv scripts/testv/ltv48_OMASA_4ISM_1TC_ISM4.csv scripts/testv/ltv48_OMASA_4ISM_1TC.met scripts/switchPaths/sw_13k2_512k_2fr_start_32k_omasatechs_4ism.bin 48 scripts/testv/ltv48_OMASA_4ISM_1TC_+10dB.wav output.192
IVAS_dec -fr 20 EXT 48 output.192 output.wav
```
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issue