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/pppoe/default.nix

@@ -1,7 +1,9 @@
-{ lib
-, stdenv
-, fetchFromGitHub
-, ppp } :
+{
+  lib,
+  stdenv,
+  fetchFromGitHub,
+  ppp,
+}:
 stdenv.mkDerivation rec {
   pname = "rp-pppoe";
   version = "3.15";
@@ -20,7 +22,9 @@ stdenv.mkDerivation rec {
     export PPPD=${ppp}/sbin/pppd
   '';
 
-  configureFlags = lib.optionals (stdenv.buildPlatform != stdenv.hostPlatform) [ "rpppoe_cv_pack_bitfields=rev" ];
+  configureFlags = lib.optionals (stdenv.buildPlatform != stdenv.hostPlatform) [
+    "rpppoe_cv_pack_bitfields=rev"
+  ];
 
   postConfigure = ''
     sed -i Makefile -e 's@DESTDIR)/etc/ppp@out)/etc/ppp@'