Streaks aren't always recalculated

[trailtacos]

The streak re-calculation requires that an admin remembers to "Save Race" - that code (in race_controller.rb) will reclaculate streaks for racers in this race, and the previous one.

Occasionally this leaves streaks not reset (when save race is not used for a race).

A simple fix here would be to recalculate streaks for every race where streaks > 0 or those in the current race.

The impact here is two fold:

1. Incorrect stats for a user
2. The likely race list containing people not on streaks

I've fixed all people manually for the moment.