Allow courrier to delete item in order

app/models/orderitem.py

@@ -49,6 +49,6 @@ class OrderItem(db.Model):
         if user_id is None:
             return False
         user = User.query.filter(User.id == user_id).first()
-        if user and user.is_admin():
+        if user and (user.is_admin() or user == self.order.courrier):
             return True
         return False