nixfmt-rfc-style

There is nothing in this commit except for the changes made by
nix-shell -p nixfmt-rfc-style --run "nixfmt ."

If this has mucked up your open branches then sorry about that. You
can probably nixfmt them to match before merging

tests/min-copy-closure/with-figlet.nix

@@ -1,6 +1,6 @@
-{ pkgs, ... } :
+{ pkgs, ... }:
 {
-  imports= [./config-ext4.nix];
+  imports = [ ./config-ext4.nix ];
   defaultProfile.packages = with pkgs; [
     figlet
   ];