fix delete user

app/main/routes.py

@@ -210,7 +210,7 @@ def remove_player(game_name, username):
     if not game.owned_by(current_user):
         abort(403)
     user = User.query.filter(and_(User.name == username, User.games.contains(game))).first_or_404()
-    game.players.remove(user)
+    game.users.remove(user)
     if not user.last_login:
         db.session.delete(user)
     db.session.commit()