[media] Revise OpusAudioDecoder::Reset() via OPUS_RESET_STATE #5914

Job	Run time
linux-coverage / initialize	42s
linux-coverage / docker-build-image	1m 15s
linux-coverage / docker-unittest-image	42s
linux-coverage / linux_devel	9m 45s
linux-coverage / linux_debug	7m 28s
linux-coverage / linux_qa	6m 23s
linux-coverage / linux_gold	5m 20s
linux-coverage / linux_coverage_test	1h 10m 13s
linux-coverage / ${{ matrix.name }}_on_device_${{ matrix.shard }}	0s
	1h 41m 48s

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