validate_peaks(): Remove drifting and proximity checks, and use original coordinates

We trust the HDF5 peaks, even if we can't see a peak there.  That means
we can't reliably take a centroid and "improve" the coordinates.  In
some cases, the centroiding procedure seems to be making the peak
coordinates worse than they were originally.

Now, the only remaining checks are:
1. Is the peak in a bad region of the detector?
2. Is it saturated? (but --use-saturated is the default)
3. If --check-hdf5-snr, is it above the minimum SNR?

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