ivas_cpe_enc_fx(): Wrong calculation of total_brate
# Basic info
Related to https://forge.3gpp.org/rep/sa4/audio/ivas-basop/-/issues/2344#note_107024
<!--- Add commit SHA used to reproduce -->
- Fixed point:
- Encoder (fixed): 5e6b49548a472a50b079909c5ea7a6bc94523460
- Decoder (fixed): n/a
# Bug description
The calculation of `sts[n]->total_brate` in `ivas_cpe_enc_fx()` is not working correctly (at least for some cases):
```
sts[n]->total_brate = L_shl( div_l( hCPE->element_brate, n_CoreChannels ), 1 ); /* Q0 */
```
For example, for a total_brate of 384000, the expression returns 65534.
# Ways to reproduce
Commandline from https://forge.3gpp.org/rep/sa4/audio/ivas-basop/-/issues/2317:
<!-- Commandline or script -->
```bash
IVAS_cod -dtx -masa 2 ltv48_MASA2TC.met scripts/switchPaths/sw_13k2_512k.bin 48 ltv48_MASA2TC.wav bit.192
```
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issue