Encoder crash for Stereo in TNSAnalysisStereo_fx()
# Basic info
<!--- Add commit SHA used to reproduce -->
- Encoder: e1432023
- Decoder: N/A
# Bug description
The fixed point encoder crashes with an assert:
```
Assertion failed: (0), function saturate, file basop32.c, line 507.
```



# Ways to reproduce
Input vector has been uploaded.
The crash occurs at both 48kbps and 64kbps with `-max_band` WB, SWB and FB. Commandline and screenshots correspond to 48kbps FB.
```
./IVAS_cod_fx -stereo -max_band FB 48000 48 dm1aa1s08_48.10dB.wav bit
```
issue