Fix whisper-fetch.py --drop timestamps

[cdeil]

Possible fix for #305 .

I didn't test this, not sure if this is correct.

Specifically I don't know how timestamps and offsets in Whisper files work. Is a simple t + step appropriate, or is taking into account an offset and wrap-around needed?

[piotr1212]

this should work, the wraparounds are handled by whisper.py

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[piotr1212]

Sorry, forgot about this.

This is definitely an improvement over the current situation, but the json part is still incorrect as it removes values but does not even have a timestamp, there is no way to know which timestamps have been removed.

@cdeil did you have time to test this?