sb3: minor: saved state adds doc to history

First of all, thank you very much for adding a saved history. It gets me up and running much more quickly.

But (and there would have to be a “but,” since this is the Bug Hunt forum) Scrivener doesn’t resume using a document that is in the middle of the history. Rather, Scrivener adds the document being edited to the end of the history so that there is an additional copy of the document in the history.