nixosConfigurations: move input forwarding to inline module

Inspired by https://jade.fyi/blog/flakes-arent-real/, this is better for
composability:
>  it also doesn't work outside of the flake that's actually invoking nixpkgs.lib.nixosSystem. The latter is the much more sinister part, and the reason I would strongly recommend inline modules with closures instead of specialArgs: they break flake composition.

For now, the `system` remains a specialArg, until I decide what to do
with that.

hosts/thinknix/default.nix

@@ -1,4 +1,4 @@
-{ config, lib, pkgs, inputs, ...}:
+{ config, lib, pkgs, ...}:
 {
   imports = [
     ../../common

hosts/thinknix/hardware-configuration.nix

@@ -1,4 +1,4 @@
-{ config, lib, pkgs, modulesPath, inputs, ... }:
+{ config, lib, pkgs, modulesPath, ... }:
 
 
 {

hosts/thinknix/secureboot.nix

@@ -1,4 +1,4 @@
-{ config, lib, pkgs, inputs, ...}:
+{ config, lib, pkgs, ...}:
 {  
   boot.loader.efi.canTouchEfiVariables = true;
 

hosts/thinknix/storage.nix

@@ -1,4 +1,4 @@
-{ config, lib, pkgs, inputs, ...}:
+{ config, lib, pkgs, ...}:
 let
   fsOptions = [ "noatime" "ssd" "space_cache" "compress=zstd" ];
 in