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/schnapps/default.nix

@@ -1,17 +1,17 @@
 {
-  stdenv
-, fetchFromGitLab
-, makeWrapper
-, btrfs-progs
-, util-linux-small
-, lib
+  stdenv,
+  fetchFromGitLab,
+  makeWrapper,
+  btrfs-progs,
+  util-linux-small,
+  lib,
 }:
 let search_path = lib.makeBinPath [btrfs-progs util-linux-small];
 in stdenv.mkDerivation {
   pname = "schnapps";
   version = "2.13.0";
 
-  src =fetchFromGitLab {
+  src = fetchFromGitLab {
     domain = "gitlab.nic.cz";
     owner = "turris";
     repo = "schnapps";