Support of lower sample rates in MASA prerenderer algorithms within external renderer

Basic info

• Commit SHA: main
• Platform: all

Bug description

The MASA prerenderer and merging functions do not properly support sample rates that are lower than 48 kHz and this causes sanitizer errors (and crashes in BASOP side). Example of a new sanitizer error is in this job https://forge.3gpp.org/rep/ivas-codec-pc/ivas-codec/-/jobs/484763

This should be corrected.

Ways to reproduce

Run external renderer with combining MASA + (MC|ISM|SBA) to MASA output and use sample rate lower than 48 kHz.