Previously, it would take the guid and try to search for that in the
episode URL column, which may not find a match (or possibly even find
the wrong match).
testDoNotFailToUpdateEpisodeActionByGuidIfThereIsAnotherWithTheSameValueForEpisodeUrl
didn't catch this issue because it used the same value for episode and
guid when updating at line 84, so fix that as well. And for good
measure, give the save actions different position values, so the asserts
actually check that the saves have succeeded and they found the right
episode.
