Add another threshold to filter out common hallucinations

The paper recommends filtering out segments with no_speech_prob > 0.6
and avg_logprob < -1. This is too loose of a bound for short-form audio
which is not guaranteed to contain speech.

I already have a tighter bound:

  no_speech > 0.6 and avg_logprob < -0.5

While listening to instrumental music I find that a lot of
hallucinations sneak past that bound. So I added a second bound:

  no_speech > 0.15 and avg_logprob < -0.7

Basically we filter out things that look like speech but have a worse
avg_logprob. Seems to not have false negatives. Requires testing.

Also: dial back the default max segment length from 15 seconds to 10
seconds. This is done based on performance observations in desktop.

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