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/usb.nix

@@ -24,8 +24,6 @@
       EXT4_FS = "y";
       EXT4_USE_FOR_EXT2 = "y";
       FS_ENCRYPTION = "y";
-
-
     };
   };
 }