nix: fix config for echo/test on newer busybox
Matches https://github.com/NixOS/nix/commit/2f1a1c5a49b50594a4aa9d4729a5b64255dd0932
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de243f24
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Matches https://github.com/NixOS/nix/commit/2f1a1c5a49b50594a4aa9d4729a5b64255dd0932