save rubric tabs on annotator close
Perhaps Annotator close should sync the tabs. Currently:
- tab state is saved on "sync" button (supposed to be, I should check it actually does)
- tab state is saved on Marker close. The last one feels odd to me. Logically they are part of annotator. Is it to facilitate rapid closing and re-opening of Annotator? It would be better to fix "tagg
(Ultimately they should sync in some kind of background thread, but that is longer term).