Fix #571 -- Partial payments and refunds

src/tests/plugins/pretixdroid/test_simple.py

@@ -32,7 +32,7 @@ def env():
     o1 = Order.objects.create(
         code='FOO', event=event, status=Order.STATUS_PAID,
         datetime=now(), expires=now() + timedelta(days=10),
-        total=0, payment_provider='banktransfer'
+        total=0
     )
     op1 = OrderPosition.objects.create(
         order=o1, item=shirt, variation=shirt_red,

src/tests/plugins/pretixdroid/test_subevents.py

@@ -35,7 +35,7 @@ def env():
     o1 = Order.objects.create(
         code='FOO', event=event, status=Order.STATUS_PAID,
         datetime=now(), expires=now() + timedelta(days=10),
-        total=0, payment_provider='banktransfer'
+        total=0
     )
     op1 = OrderPosition.objects.create(
         order=o1, item=shirt, variation=shirt_red,