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

modules/busybox.nix

@@ -85,10 +85,13 @@ in {
       };
     };
     filesystem = dir {
-      bin = dir ({
-        busybox = symlink "${busybox}/bin/busybox";
-        sh = symlink "${busybox}/bin/busybox";
-      } // makeLinks);
+      bin = dir (
+        {
+          busybox = symlink "${busybox}/bin/busybox";
+          sh = symlink "${busybox}/bin/busybox";
+        }
+        // makeLinks
+      );
     };
   };
 }