refactor(flake): tidy up inputs attrset

Author: Marc Jakobi

flake.nix

@@ -18,7 +18,6 @@
     self,
     nixpkgs,
     flake-utils,
-    gen-luarc,
     ...
   }: let
     systems = builtins.attrNames nixpkgs.legacyPackages;
@@ -35,7 +34,7 @@
           # This adds a function can be used to generate a .luarc.json
           # containing the Neovim API all plugins in the workspace directory.
           # The generated file can be symlinked in the devShell's shellHook.
-          gen-luarc.overlays.default
+          inputs.gen-luarc.overlays.default
         ];
       };
       shell = pkgs.mkShell {