flake.nix: Remove redundant module lambda

flake.nix

@@ -41,11 +41,11 @@
 
               in
               map addModuleDeclarationFile modules ++ [
-                ({ config, ... }: {
+                {
                   system.nixos.versionSuffix =
                     ".${final.substring 0 8 (self.lastModifiedDate or self.lastModified or "19700101")}.${self.shortRev or "dirty"}";
                   system.nixos.revision = final.mkIf (self ? rev) self.rev;
-                })
+                }
               ];
           });
       });