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/lzma/default.nix

@@ -1,7 +1,4 @@
-{
-  stdenv
-, fetchurl
-}:
+{ stdenv, fetchurl }:
 stdenv.mkDerivation {
   pname = "lzma";
   version = "4.32.7";