Bugfix: The `--use-fs-snapshot` option now works on windows/386

Restic failed to create VSS snapshots on windows/386 with the following error:

    GetSnapshotProperties() failed: E_INVALIDARG (0x80070057)

This is now fixed.

https://github.com/restic/restic/issues/3087
https://github.com/restic/restic/pull/3090
