fix(xo-server/file restore): dont fail on LVM partitions

Fixes xoa-support#2640

Introduced by 48ce7df43

The issue was due to object spreading copying only own properties but `path` is now an inherited property due to `dedupeUnmount`.

CHANGELOG.unreleased.md

@@ -15,6 +15,7 @@
 > Users must be able to say: “I had this issue, happy to know it's fixed”
 
 - [Restore legacy, File restore legacy] Fix mount error in case of existing proxy remotes (PR [#5124](https://github.com/vatesfr/xen-orchestra/pull/5124))
+- [File restore] Don't fail with `TypeError [ERR_INVALID_ARG_TYPE]` on LVM partitions
 
 ### Packages to release
 

packages/xo-server/src/xo-mixins/file-restore-ng.js

@@ -366,7 +366,7 @@ export default class BackupNgFileRestore {
         ).lv_path
       )
       unmountQueue.push(partition.unmount)
-      return { ...partition, unmount }
+      return { __proto__: partition, unmount }
     }
 
     return mountPartition(