Fix fee calculation for tournament registration

Correctly calculate fee based on minimum team size instead of current
number of players

tournaments/services/tournament_registration.py

@@ -176,8 +176,8 @@ class RegistrationCartManager:
         players = self.session.get('registration_cart_players', []),
         entry_fee = tournament.entry_fee
         if entry_fee is not None and entry_fee > 0 and tournament.enable_online_payment:
+            fee = entry_fee * tournament.minimum_player_per_team
             players = self.session.get('registration_cart_players', [])
-            fee = entry_fee * len(players)
             club_members = sum(1 for player in players if player.get('club_member', False))
             if tournament.club_member_fee_deduction is not None:
                 return fee - club_members * tournament.club_member_fee_deduction