style fixing

InvenTree/order/views.py

@@ -12,7 +12,7 @@ from django.urls import reverse
 from django.utils.translation import ugettext_lazy as _
 from django.views.generic import DetailView, ListView, UpdateView
 from django.views.generic.edit import FormMixin
-from django.forms import HiddenInput
+from django.forms import HiddenInput, IntegerField
 
 import logging
 from decimal import Decimal, InvalidOperation