Frames with no VAD are shortened, not dropped

On PCM buffers of length >= captureParams.dropStartSilence, a
"no voice" VAD verdict would result in the PCM buffer being entirely
cleared. The emergent behavior is that when VAD segments speech,
words right after the segmentation window can frequently be dropped.

By removing a prefix from the PCM buffer and clearing the VAD buffers,
the transcription algorithm has access to "leading" frames before the
frames which triggered VAD. This reduces cases where words are omitted
in the middle of long statements.

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