[Non-BE] Resolve "dpid 0 used irrespective of the specified one for ism1"

• Related issues: #1229 (closed)
• Requested reviewers: @norvell, @demirkanik

Reason why this change is needed

A render_config file containing multiple directivity patterns may be provided to the decoder accompanied with -dpid <id> to specify the index of the directivity pattern to use. For ISM 1, this does not work as expected and index 0 is used irrespective of the specified directivity pattern.

Description of the change

bug fix to allow specified directivity pattern id for ISM 1 to have an effect and work as expected.

Affected operating points

ISM 1 all bitrates

Produced bitstream is BE compared to previous state.

decoder is NON-BE since the selection of directivity pattern id for ISM 1 now works as expected instead of always using the default id 0.

Related to #1229 (closed)