Fix prize eligibility check

Looks like the question "are you currently a full-time student" is used to determine the team's eligibility for prizes, but this is not consistent with the rules for student teams:

"Student Team: A team comprised entirely of currently enrolled students. Each member may be either a full-time or a part-time student. Students may be enrolled at any accredited educational institution. MegaMinerAI is not limited to S&T students."

So either this check or the rules need to be updated, depending on whether part-time students should be eligible or not.