set default for Question container_type

src/pretix/base/migrations/0309_alter_questionanswer_unique_together_and_more.py

@@ -15,7 +15,6 @@ class Migration(migrations.Migration):
             model_name='question',
             name='container_type',
             field=models.CharField(default='P', max_length=5),
-            preserve_default=False,
         ),
         migrations.AddField(
             model_name='questionanswer',

src/pretix/base/models/items.py

@@ -1651,6 +1651,7 @@ class Question(LoggedModel):
         max_length=5,
         choices=CONTAINER_TYPE_CHOICES,
         verbose_name=_("Asked on"),
+        default=CONTAINER_TYPE_ORDERPOSITION,
     )
     question = I18nTextField(
         verbose_name=_("Question")