Clean up code

mautrix_telegram/util/__init__.py

@@ -2,3 +2,7 @@ from .file_transfer import transfer_file_to_matrix, convert_image
 from .format_duration import format_duration
 from .signed_token import sign_token, verify_token
 from .recursive_dict import recursive_del, recursive_set, recursive_get
+
+
+def ignore_coro(coro):
+    pass

mautrix_telegram/util/file_transfer.py

@@ -21,7 +21,6 @@ import logging
 import asyncio
 
 import magic
-from sqlalchemy import orm
 from sqlalchemy.exc import IntegrityError, InvalidRequestError
 
 from telethon.tl.types import (Document, FileLocation, InputFileLocation,