Resolve "Wrong indexing while reading external orientations in renderer"

• Related issues: #1168 (closed)
• Requested reviewers: @pihlajakuja @tamarapu @sagnowski

Reason why this change is needed

The indexing is wrong while reading external orientations from a file in renderer.c lines 1565-1567.

        for ( sf_idx = 0; sf_idx < num_subframes; sf_idx++ )
        {
            if ( ( error = ExternalOrientationFileReading( externalOrientationFileReader, &quatBuffer[i], &enableHeadRotation[i], &enableExternalOrientation[i], &enableRotationInterpolation[i], &numFramesToTargetOrientation[i] ) ) != IVAS_ERR_OK )
            {

The reading loops over sf_idx, but the updated values are indexed with i.

Description of the change

The index i should be replaced with the correct index sf_idx.

Affected operating points

IVAS_rend output will be non-BE when external orientations are enabled (-exof flag).