In #3863, it was discovered that volumes from projected sources were
being backed up by restic when they should have been skipped. Restoring
these volumes triggers a known bug in restic.

In #3866, we started skipping volumes from a projected source, however
there will exist backups that were taken before this fix was introduced.
This change modifies the restore logic to skip the restore of any volume
that came from a projected source, allowing backups taken before #3866
to be restored successfully.
Signed-off-by: Bridget McErlean <bmcerlean@vmware.com>