flake: remove pkgsUnfree arg

flake/default.nix

@@ -1,4 +1,3 @@
-{ inputs, ... }:
 {
   imports = [
     ./dev
@@ -10,15 +9,4 @@
     ./tests.nix
     ./wrappers.nix
   ];
-
-  perSystem =
-    { system, ... }:
-    {
-      _module.args = {
-        pkgsUnfree = import inputs.nixpkgs {
-          inherit system;
-          config.allowUnfree = true;
-        };
-      };
-    };
 }

flake/tests.nix

@@ -5,18 +5,10 @@
 }:
 {
   perSystem =
-    {
-      pkgs,
-      pkgsUnfree,
-      ...
-    }:
+    { pkgs, ... }:
     {
       checks = pkgs.callPackages ../tests {
-        inherit
-          helpers
-          pkgsUnfree
-          self
-          ;
+        inherit helpers self;
       };
     };
 }