Artifact in bitrate switching in McMASA causes high MLD values for BASOP

This is linked to BASOP ticket sa4/audio/ivas-basop#1067 (comment 56497) .

I checked the latest version (d6e5b4e5) and it is still there. Issue happens in frame 105 when switching from 16.4 kbps to 48 kbps in McMASA for channels 2,6,8,19,12. Although MC bitrate switching has audible issues in general this one is affecting the MLD scores in BASOP as shown in above ticket since issue in BASOP is not there.

To reproduce:

IVAS_cod -mc 7_1_4 ./scripts/switchPaths/sw_mctech_5fr.bin 48 ./scripts/testv/stv714MC48c.wav bit

IVAS_dec 7_1_4 48 bit stv714MC48c.dec.7_1_4.wav

Assigning @paulusj for awareness.