BASOP assert in renderer for MASA2 to MONO with ltv signal

Basic info

• Fixed point: b0d052d7

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

./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