Saved state restore should ignore prescan flag in some cases

[Steven Levine]

We changed the save state restore to ignore drives marked no prescan.

This makes sense when restoring the saved shutdown state. It does not make quite so much sense for user created saved states. The current behavior makes it impossible to save the state of folders on no-prescan drives. The assumption here is that the user knows that the drives are marked no prescan, but that the folder setup is worth saving.

User saved states should ignore the no-prescan flag or, if some prefer the current behavior, there should be an option to control this behavior.