correct fix

Author: Ilija Vukotic

tests/servicex_did_finder_lib/test_communication.py

@@ -446,7 +446,7 @@ async def my_user_callback(did, info):
 
     assert SXAdaptor.put_file_add.call_count == 1
     assert SXAdaptor.put_file_add.call_args_list[0][0][0][0]['paths'][0] == '/tmp/foo'
-    assert SXAdaptor.put_file_add.call_args_list[0][1][0][0]['paths'][0] == '/tmp/bar'
+    assert SXAdaptor.put_file_add.call_args_list[0][0][0][1]['paths'][0] == '/tmp/bar'
 
     SXAdaptor.put_fileset_complete.assert_called_once
     assert SXAdaptor.put_fileset_complete.call_args[0][0]['files'] == 2