Missing Integral Factor in Flash Matching

[bear-is-asleep]

The integral factor corrects the hypothesis flash for the width of the flash. It is currently missing in the sbncode OpT0Finder, but can be found in the standalone OpT0Finder - https://github.com/bear-is-asleep/OpT0Finder/blob/996fb419aa7ac6096f8f47ed5663d8eae048fe52/flashmatch/Algorithms/QLLMatch.cxx#L425-L428.