Remove unused imports

src/pretix/control/views/item.py

@@ -1,6 +1,6 @@
 from itertools import product
 from django.db import transaction
-from django.forms import BooleanField, ModelForm
+from django.forms import BooleanField
 from django.utils.functional import cached_property
 
 from django.views.generic import ListView

src/pretix/control/views/orders.py

@@ -1,7 +1,6 @@
 from itertools import groupby
 from django.contrib import messages
 from django.core.urlresolvers import reverse
-from django.db.models import Q
 from django.utils.timezone import now
 from django.utils.translation import ugettext_lazy as _
 from django.http import HttpResponse