manage_participants: order list by ID

manage_participants.py

@@ -14,7 +14,7 @@ db = SQLAlchemy(app)
 
 
 def show_participants():
-    for p in Participant.query.all():
+    for p in Participant.query.order_by(Participant.id).all():
         print("[{}] {}, {} ({}) is {} "
               "and has UUID {} ({})".format(p.id,
                                             p.name,