change unit test usage of notes field (#780)

Added an extra `waitFor` after a flaky unit test step.

I'm not really super happy with this workaround.. but it does make the
test much more stable (re-ran 5x and no failures:
https://github.com/actualbudget/actual/actions/runs/4455134799).

I think there is some internal timeout happening somewhere which is
causing this issue.. But not really sure where. And this will hopefully
get auto-fixed once we migrate to a new table.