test(openai): drop the audio snapshot nothing reads

The mutex round the realtime transport double added a snapshot accessor for each
recorded slice. Only the event one has a caller, so make lint refuses the build:

    realtime_doubles_test.go:64:25: func (*fakeTransport).recordedAudio is unused (unused)

No spec has ever read the audio log, before the mutex or after it, so the
accessor is deleted rather than nolinted and the struct comment says where the
next one comes from. audioLog stays written, because a double that silently
discarded what a coordinator sent it would be a different double.

Assisted-by: Claude Opus 5 [claude-code]
Signed-off-by: Ettore Di Giacinto <mudler@localai.io>
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