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/service-fns/default.nix

@@ -1,4 +1,4 @@
-{writeText}:
+{ writeText }:
 writeText "service-fns.sh" ''
   output() { cat $1/.outputs/$2; }
   output_word() {