Fix persistence and update deprecated dependencies

package.nix

@@ -2,7 +2,10 @@
 , ruby
 , makeWrapper
 , pkg-config
-, xorg
+, libxcb
+, xcbutilwm
+, xrandr
+, xprop
 , rubyPackages
 , gcc
 , lib
@@ -24,10 +27,10 @@ stdenv.mkDerivation {
     (ruby.withPackages (ps: [
       ps.ffi
     ]))
-    xorg.libxcb
-    xorg.xcbutilwm
-    xorg.xrandr
-    xorg.xprop
+    libxcb
+    xcbutilwm
+    xrandr
+    xprop
   ];
 
   buildPhase = ''
@@ -53,8 +56,8 @@ stdenv.mkDerivation {
 
     wrapProgram $out/bin/kutu.rb \
       --prefix PATH : ${lib.makeBinPath [
-        xorg.xrandr
-        xorg.xprop
+        xrandr
+        xprop
       ]}
   '';
 }