BASOP assert in renderer for MASA2 to MONO with ltv signal
# Basic info
<!--- Add commit SHA used to reproduce-->
- Fixed point: b0d052d712605907a663aceda3b96cd513d9e7c3
# Bug description
Renderer crashes with ltv signal for MASA2 to mono rendering (and a few other MASA and OMASA formats).
```
IVAS_rend: lib_basop/basop32.c:483: saturate: Assertion `0' failed.
```
The scheduled LTV tests recognize this, but for some (to be found out) reason, the report does not have this testcases as ERROR, just as usual FAILED: https://forge.3gpp.org/rep/sa4/audio/ivas-basop/-/jobs/732694
# Ways to reproduce
<!--Commandline or script-->
```bash
./IVAS_rend -i ltv16_MASA2TC.wav -if MASA2 -o MASA2_to_MONONone_20msNone_16kHz.wav -of MONO -fs 16 -no_delay_cmp -im ltv48_MASA2TC.met -fr 20
```
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issue