nixos/snapper: can't use bcachefs

[yzhou216]

Nixpkgs version

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Describe the bug

Enum should have bcachefs since it's supported by snapper.

type = lib.types.enum [ "btrfs" ];

Steps to reproduce

Set to bcachefs

Expected behaviour

Support bcachefs

System metadata

• system: "x86_64-linux"
• host os: Linux 6.14.0-rc7, NixOS, 25.05 (Warbler), 25.05.20250319.11353d3
• multi-user?: yes
• sandbox: yes
• version: nix-env (Nix) 2.24.12
• nixpkgs: /nix/store/z9xh1xcm91invhw2np79d0gf5ak5mvwr-source

Notify maintainers

@Djabx

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