Change calculation of a sentence reduction for good behavior during confinement in a jail

LB 640 modifies Nebraska's law (section 47-502) governing sentence reductions for good behavior in city or county jails. It changes how the reduction applies by allowing inmates to earn one day off their total remaining sentence - covering all consecutive sentences - for each day they maintain good conduct after the first 15 days of confinement. This directly affects individuals incarcerated in local jails, including those serving sentences for parole or probation violations. The bill repeals the original section and clarifies that the reduction applies to the "aggregate of [the inmate's] remaining term" rather than individual sentences.