Reopen the OPUS decoder when a note moves to another sample (#7137)

The decoder cached on a note was keyed on nothing, so a note reused for a
different streamed sample carried on decoding the previous track. Audible as
the wrong custom music: the sequence and soundfont the audio editor reports
are correct, only the samples reaching the mixer are not.

Reproduced on the game-start cutscene chain with a streamed music pack in 4
of 6 runs; 0 of 6 after.

Co-authored-by: Claude Opus 5 <noreply@anthropic.com>
Co-authored-by: serprex <159546+serprex@users.noreply.github.com>

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