Use best averages for Scaled workouts and classes

Scaled workouts and classes are no longer functional if the echo mode PB are used. The peaks are fun to see and compare but often they are not functionally a PB for the movement as a whole.

Also I find I want to see my averages more than my peaks because that’s what actually helps me determine what load to set for old school or a rough free weight starting point. It’s cumbersome to look through every set to see averages in the exercise history. I’d rather have an option to toggle between peak and average of each set in the exercise history chart.