update chi2 with scale factors for the MC

This commit updates the chi2 script to add scale factors for the
atmospheric neutrino scale and muon scale parameters. The reason for
this is that these parameters should now have a much easier
interpretation than before. Now, the atmospheric neutrino scale
parameter is relative to the expected atmospheric neutrino flux (i.e. we
expect the fit to return something close to 1), and the muon scale
parameter is the total number of expected muons in our sample, which is
exactly what the data cleaning analysis gives us.

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