evilpixie: use finalAttrs pattern

pkgs/applications/graphics/evilpixie/default.nix

···
 , impy
 }:
 
-stdenv.mkDerivation rec {
+stdenv.mkDerivation (finalAttrs: {
   pname = "evilpixie";
   version = "0.3.1";
 
   src = fetchFromGitHub {
     owner = "bcampbell";
     repo = "evilpixie";
-    rev = "v${version}";
+    rev = "v${finalAttrs.version}";
     sha256 = "sha256-+DdAN+xDOYxLgLHUlr75piTEPrWpuOyXvxckhBEl7yU=";
   };
 
···
     # https://github.com/bcampbell/evilpixie/issues/28
       stdenv.isAarch64;
   };
-}
-
+})