[media] Fix failing to reset all status in AdaptiveAudioDecoder (#2875)

1. This PR (#2287) returns an
empyt DecodedAudio if it is end of stream. However,
|first_input_written_| doesn't reset during
AdaptiveAudioDecoder::ResetInternal(), causing it failed on
AudioDecoderTest reset-related tests.
2. On ps5, |output_format_checked_| doesn't reset cause |resampler_| and
|channel_mixer_| are nullptr, causing AudioDecoderTests fails.

b/333416579
b/333412348
b/320568573

Test-On-Device: true
(cherry picked from commit 32a2037)

starboard/shared/starboard/player/filter/adaptive_audio_decoder_internal.cc

@@ -199,6 +199,8 @@ void AdaptiveAudioDecoder::ResetInternal() {
   flushing_ = false;
   stream_ended_ = false;
   first_output_received_ = false;
+  first_input_written_ = false;
+  output_format_checked_ = false;
 }
 
 void AdaptiveAudioDecoder::OnDecoderOutput() {