overridePkgs: drop unneeded parantheses

lib/modules/machineModules/overridePkgs.nix

@@ -7,11 +7,11 @@
 }:
 {
   imports = [
-    ({
+    {
       # For vars we need to ensure that the system so we run vars generate on
       # is in sync with the pkgs of the system
       nixpkgs.hostPlatform = lib.mkForce pkgs.system;
       nixpkgs.pkgs = lib.mkForce pkgs;
-    })
+    }
   ];
 }