Fix isort issues

src/pretix/api/middleware.py

@@ -35,7 +35,6 @@ from pretix.api.models import ApiCall
 from pretix.base.models import Organizer
 from pretix.helpers import OF_SELF
 
-
 logger = logging.getLogger(__name__)
 
 

src/pretix/control/views/organizer.py

@@ -64,7 +64,7 @@ from django.views.generic import (
     UpdateView,
 )
 
-from pretix.api.models import WebHook, ApiCall
+from pretix.api.models import ApiCall, WebHook
 from pretix.api.webhooks import manually_retry_all_calls
 from pretix.base.auth import get_auth_backends
 from pretix.base.channels import get_all_sales_channels