[Query loop] Undo not functioning on query parameters

[quantumleap33]

Description

Undo does not seem to be functioning on adding/removing query parameters.

Steps to reproduce

1. Add a query loop
2. Add a query parameter
3. Add another query parameter
4. Click the undo button

Expected behavior

Undo remembers the previous action and restores accordingly

Actual behavior

Undo doesn't do anything.