fix tests leaking

Author: Bud-Macaulay

optimade/server/create_app.py

@@ -296,7 +296,6 @@ async def set_context(request, call_next):
             and static_dir.is_dir()
             and os.access(static_dir, os.R_OK)
         ):
-            # Import here to avoid circular imports if needed
             from fastapi.staticfiles import StaticFiles
 
             app.mount(