[regression] Encoder abort (divide by zero) for MC 5.1+2 encoding in ivas_param_mc_quantize_ilds_fx()
# Basic info
<!--- Add commit SHA used to reproduce -->
- Float reference:
- Encoder (float):
- Decoder (float):
- Fixed point:
- Encoder (fixed): d3fbdc6bf2952e37f31a357e9fe3a9f4af118858
- Decoder (fixed):
# Bug description
The fixed point encoder exits with SIGABRT:
{width=399 height=202}
# Ways to reproduce
Box folder: ...\Box_EXTERNAL_IVAS_BASOP_VERIFICATION\issues\issue-1453
<!-- Commandline or script -->
```bash
./IVAS_cod_fx -mc 5_1_2 -max_band WB 96000 16 bm3aa1s07_16.wav bit
```
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issue