Drop leftover input

Author: tfc

flake.lock

@@ -4,7 +4,6 @@
     disko.url = "github:nix-community/disko";
     disko.inputs.nixpkgs.follows = "nixpkgs";
     flake-parts.url = "github:hercules-ci/flake-parts";
-    nspawn-nixos.url = "/home/tfc/src/nspawn-example";
   };
 
   outputs = inputs: inputs.flake-parts.lib.mkFlake { inherit inputs; } {