storage: Fix regression with restoring backups with storage

Sunil Mohan Adaparequested to merge
sunilmohan/freedombox:fix-backup-restore-for-storage into master

Regression was introduced in a2d07fef when backup data import from manifest was inadvertently removed.

Closes: #1636 (closed).

Test:

Create a backup with this patch and 'storage' as one of the selected apps for backup. Try to restore the backup without the patch. Observe that it fails. Restore the backup with the patch. Observe that it succeeds.

Signed-off-by: Sunil Mohan Adapa sunil@medhas.org

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