Format settings after env isolation changes

mandelstudio/settings/base.py

@@ -36,6 +36,7 @@ INSTALLED_APPS = [
     "mandelstudio",
 ] + INSTALLED_APPS
 
+
 # Never allow demo-data plugins in this production project context.
 def _is_demo_data_app(app_label: str) -> bool:
     normalized = "".join(ch for ch in app_label.lower() if ch.isalnum())