refactor(api): clean up imports and add spacing for readability

- Removed duplicate import of `FolderValidationError` in `rest_api.py` to streamline the code.
- Added a blank line in `db.py` before the `list_folders` function to enhance code readability.
- These changes improve the organization and clarity of the API codebase.

autogpt_platform/backend/backend/api/features/library/db.py

@@ -952,6 +952,7 @@ async def add_store_agent_to_library(
 ############ Folder DB Functions #############
 ##############################################
 
+
 async def list_folders(
     user_id: str,
     parent_id: Optional[str] = None,

autogpt_platform/backend/backend/api/rest_api.py

@@ -45,13 +45,13 @@ from backend.api.features.chat.completion_consumer import (
     start_completion_consumer,
     stop_completion_consumer,
 )
+from backend.api.features.library.exceptions import FolderValidationError
 from backend.blocks.llm import DEFAULT_LLM_MODEL
 from backend.data.model import Credentials
 from backend.integrations.providers import ProviderName
 from backend.monitoring.instrumentation import instrument_fastapi
 from backend.util import json
 from backend.util.cloud_storage import shutdown_cloud_storage_handler
-from backend.api.features.library.exceptions import FolderValidationError
 from backend.util.exceptions import (
     MissingConfigError,
     NotAuthorizedError,