Detchar check should run across the entire template duration for CBC events, not just the superevent t_start and t_end

See https://gracedb.ligo.org/superevents/S190426c/

The detchar check ran from the superevent start 1240327332.331668 to end 1240327334.353516 plus the 2s buffer on each side. That's a total of ~6 seconds. However, the template duration as reported by gstlal in the preferred event https://gracedb.ligo.org/events/G330687/view/ is 102.240577605 seconds long, with end time 1240327333.336539466. The detchar check should run on at least this duration.