style: Apply nixpkgs-fmt and fix

Apply standard formatting and some statix conventions using;

```sh
nixpkgs-fmt **.nix && statix fix .
```

With the intent of making contribution a bit easier and reducing mental
load in hand formatting (in the same vein as [black]).

[black]: https://github.com/psf/black#the-uncompromising-code-formatter

types/swap.nix

@@ -40,7 +40,7 @@
       default = dev: [{
         swapDevices = [{
           device = dev;
-          randomEncryption = config.randomEncryption;
+          inherit (config) randomEncryption;
         }];
       }];
       description = "NixOS configuration";