cleanup whitespace and commas

* [] is now [ ]
* {} is now { }
* commas in arglists go at end of line not beginning

In short, I ran the whole thing through nixfmt-rfc-style but only
accepted about 30% of its changes. I might grow accustomed to more
of it over time

pkgs/libubootenv/default.nix

@@ -1,9 +1,10 @@
-{ stdenv
-, cmake
-, zlib
-, libyaml
-, fetchFromGitHub
-} :
+{
+  stdenv,
+  cmake,
+  zlib,
+  libyaml,
+  fetchFromGitHub,
+}:
 stdenv.mkDerivation {
   name = "libubootenv";
   src = fetchFromGitHub {