Fix Boole UT histograms on the Dashboard.

Menglin Xurequested to merge
mexu_ut_hist_add_hpath into master

Looks like after !784 (merged), some UT histograms are missing on the Dashboard because the paths are mismatched. This MR simply adds '/UT/' as a prefix to the histogram path (to match the format of other detectors) to fix this issue

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