fix lint of python test

Author: Simon-Laux

deltachat-rpc-client/tests/test_something.py

@@ -11,7 +11,7 @@
 import pytest
 
 from deltachat_rpc_client import Contact, EventType, Message, events
-from deltachat_rpc_client.const import MessageState
+from deltachat_rpc_client.const import DownloadState, MessageState
 from deltachat_rpc_client.pytestplugin import E2EE_INFO_MSGS
 from deltachat_rpc_client.rpc import JsonRpcError