Assert in ivas_hq_phase_ecu_fx in decoder for 4 discrete ISM fixed to fixed with LTV +10dB input
# Basic info
<!--- Add commit SHA used to reproduce -->
- Fixed point:
- Encoder (fixed): 4263280a4304ae791a7b2fcd91f3511e37fbecc1
- Decoder (fixed): 4263280a4304ae791a7b2fcd91f3511e37fbecc1
# Bug description
This is a crash in this daily job https://forge.3gpp.org/rep/sa4/audio/ivas-basop/-/jobs/598383
There is an assert happening within FEC_HQ_phase_ecu_fx.c. It happens in frame 3812. Stack trace below:

# Ways to reproduce
Use the command-line below and the bitstream from Box (to simplify having +10 dB input)
Box folder: ...\Box_EXTERNAL_IVAS_BASOP_VERIFICATION\issues\issue-2170
<!-- Commandline or script -->
```bash
./IVAS_dec BINAURAL 48 debug_error.bit out.wav
```
The original issue has object editing present but this happens even without it.
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issue