Fix OSBA object-editing in BINAURAL_ROOM_IR
- Related issues: #1372 (closed)
 - Requested reviewers: @weckbecker
 
Reason why this change is needed
- OSBA object-editing uses wrong number of channels which means a processing of channels with uninitialized values.
 
Description of the change
- Correct the number of object-editing channels.
 
Affected operating points
- All is BE on self-test but avoids multiplications of metadata SBA gain with uninitialized values.
 
Edited  by vaclav