[CI] Fix for metadata files for test_renderer.py

• Related issues: sa4/audio/ivas-basop#1501 (closed)
• Requested reviewers: @tamarapu, @kiene

Reason why this change is needed

• MASA renderer tests are failing with LTV in BASOP CI, but all ISM, MASA and OMASA tests use the wrong metadata for LTV.

Description of the change

• Added file names for LTV metadata

Affected operating points

• CI only, affects renderer tests with LTV