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/routeros/default.nix

@@ -1,9 +1,9 @@
 {
-  stdenv
-, python3
-, qemu
-, fetchzip
-, writeShellApplication
+  stdenv,
+  python3,
+  qemu,
+  fetchzip,
+  writeShellApplication,
 }:
 let
   chr-image = fetchzip {
@@ -14,7 +14,7 @@ let
   ros-exec-script = stdenv.mkDerivation {
     name = "ros-exec-script";
     src = ./.;
-    buildInputs = [python3];
+    buildInputs = [ python3 ];
     buildPhase = ":";
     installPhase = ''
       mkdir -p $out/bin