codecparsers: av1parse: Add the DECODE_ONLY flag to output buffer.
When the alignment is ALIGN_FRAME and the output buf contains a frame which is not to be shown, the GST_BUFFER_FLAG_DECODE_ONLY flag should be set.
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When the alignment is ALIGN_FRAME and the output buf contains a frame which is not to be shown, the GST_BUFFER_FLAG_DECODE_ONLY flag should be set.