Fix error when retrieving groups for the display user page

main.py

@@ -182,7 +182,7 @@ def login_key(userid, key):
 def user(userid):
     if int(userid) != get_userid():
         abort(401)
-    groups = query_db('select * from groups join user_group on id=id_group where id_user = ?', userid)
+    groups = query_db('select * from groups join user_group on id=id_group where id_user = ?', (userid,))
     return render_template('user.html', groups=groups)
 
 @app.route('/user/settings/<userid>', methods=['GET', 'POST'])