update stoppig muon criteria

This commit updates the criteria for selecting stopping muons from:

- calibrated nhit < 4000
- udotr < -0.5

to

- reconstructed kinetic energy < 10 GeV

The previous criteria were intended to remove through going atmospheric
events but produced a strong bias in the comparison due to the nhit cut
and an energy bias in the data relative to the Monte Carlo. The new cut
does a good job of cutting through going muons but doesn't produce the
same bias.

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