distrobox: Use rec-less, overlay-style overridable recursive attributes

pkgs/applications/virtualization/distrobox/default.nix

···
 { stdenvNoCC, lib, fetchFromGitHub, makeWrapper, wget }:
 
-stdenvNoCC.mkDerivation rec {
+stdenvNoCC.mkDerivation (finalAttrs: {
   pname = "distrobox";
   version = "1.5.0.2";
 
   src = fetchFromGitHub {
     owner = "89luca89";
-    repo = pname;
-    rev = version;
+    repo = finalAttrs.pname;
+    rev = finalAttrs.version;
     sha256 = "sha256-ss8049D6n1V/gDzEMjywDnoke5s2we9j3mO8yta72UA=";
   };
 
···
     platforms = platforms.linux;
     maintainers = with maintainers; [ atila ];
   };
-}
+})