Update CONFIG.toml

RPS does not allow Teens to compete as Pro (Untested), Lifters under 20, that have to compete as a Pro, are categorized as Pro Juniors.

I changes the minimum age from 20 to 0. Thus allowing any Teen registered as Pro to be labelled as Junior, instead of Teen Did I get that correct?

pro_junior_20_23 = {name = "Pro Juniors 20-23", min = 0, max = 23}