competitions: Fix get_user_ranking method in SeasonSeriesMixin
competitions: Fix get_user_ranking method in SeasonSeriesMixin

rtrembecky/roots,rtrembecky/roots,matus-stehlik/roots,tbabej/roots,rtrembecky/roots,matus-stehlik/roots,tbabej/roots,tbabej/roots,matus-stehlik/roots