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/config-ext4.nix

@@ -1,6 +1,6 @@
-{ lib, ... } :
+{ lib, ... }:
 {
-  imports= [
+  imports = [
     ./configuration.nix
     ../../modules/outputs/ext4fs.nix
   ];