helmfile: Stop prefixing PATH with kubernetes-helm

So helmfile will work with helm plugins wrapped by pkgs.wrapHelm:

```
{
  inputs.nixpkgs.url = "github:NixOS/nixpkgs/nixpkgs-unstable";
  inputs.flake-utils.url = "github:numtide/flake-utils";

  outputs = { self, nixpkgs, flake-utils }:
    flake-utils.lib.eachDefaultSystem (system: let
      pkgs = nixpkgs.legacyPackages.${system};
      helm = pkgs.wrapHelm pkgs.kubernetes-helm {
        plugins = with pkgs.kubernetes-helmPlugins; [
          helm-diff helm-secrets
        ];
      };
    in {
      devShell = pkgs.mkShell {
        nativeBuildInputs = [
          helm
          pkgs.helmfile
        ];
      };
    });
}
```

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