Fixing edge check for highest pT jets

There was a bug where jets with a pT beyond the end of the histogram were receiving the uncertainty at the start of the last bin of the histogram, instead of from the end of the last bin of the histogram. This MR fixes this bug, which so far has only shown up for the Single Particle high pT term, and only for jets with pT > 5 TeV, where the uncertainty drops by a very small amount. As such, this should be a very rare bug to encounter.

Tagging @mleblanc and @tcarli for their information (reporters) Tagging @kpachal and @mtoscani for their information (other experts)