crash in SBA decoder with dtx
SBA decoding with DTX at sample rate 32000 with the command lines
```
./IVAS_cod -sba 3 -dtx -max_band swb 32000 48 input.wav bit
./IVAS_dec HOA3 48 bit_short dec.wav
```
gives the error
```
IVAS_dec: lib_com/basop32.c:2430: L_shl: Assertion `0' failed.
```
in the decoder.
This is the minimal bitstream to reproduce it [bit_short](/uploads/76640484a13ffe5c14effb6aabce3f52/bit_short)
It is probably related to #694 .
issue