Resolve "OMASA rendering to MASA 1TC makes objects on the right side disappear."
- Related issues: #1362 (closed)
 - Requested reviewers:
 
Reason why this change is needed
- This OMASA to MASA in prerenderer is missing right side content when output is 1TC MASA
 
Description of the change
- Fix by implementing the missing path in OMASA downmix of MASA prerenderer
 
Affected operating points
- IVAS_rend when input is OMASA and output is MASA1 is non-BE as old version is not correct.
 
Related to #1362 (closed)