Remove ARF mode entries from THR_MODES array in non-RD mode
Remove ARF mode entries from THR_MODES array in non-RD mode

The alternate reference frame is disabled in non-RD mode. No need
to keep the related entries in the THR_MODES array.

Change-Id: I53386f4bb1c6284f582801f27246c5edf55bc24b

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