ATR-27804 - Updates to jFex effective thresholds

"This is the first attemp at the tuned thresholds with current jFEX calibration parameters. It should get us closer to turn-on curves in the correct location, but is probably not final. However, it should give us a better idea of the sort rates to expect with the new jJ items. It will be useful to observe them when we get back into physics, but I wouldn't expect to enable them immediately. Let's see what they look like first."

This MR affects counts of numerous jFex chains.