Fix import order

app/main/views/service_settings.py

@@ -32,6 +32,7 @@ from app.extensions import zendesk_client
 from app.formatters import email_safe
 from app.main import main
 from app.main.forms import (
+    BillingDetailsForm,
     BrandingOptions,
     ConfirmPasswordForm,
     EditNotesForm,
@@ -43,7 +44,6 @@ from app.main.forms import (
     RateLimit,
     RenameServiceForm,
     SearchByNameForm,
-    BillingDetailsForm,
     ServiceContactDetailsForm,
     ServiceDataRetentionEditForm,
     ServiceDataRetentionForm,