fix: simplify import statements in osm_refresh.py

backend/scripts/osm_refresh.py

@@ -9,12 +9,7 @@ from pathlib import Path
 from typing import Callable, Sequence
 
 from backend.app.core.osm_config import DEFAULT_REGIONS
-from backend.scripts import (
+from backend.scripts import stations_import, stations_load, tracks_import, tracks_load
-    stations_import,
-    stations_load,
-    tracks_import,
-    tracks_load,
-)
 
 
 @dataclass(slots=True)