skanlite: fix gsettings crash when saving a file

pkgs/applications/kde/skanlite.nix

···
 {
   mkDerivation, lib,
+  wrapGAppsHook,
   extra-cmake-modules, kdoctools,
   kio, libksane
 }:
···
     maintainers = with maintainers; [ polendri ];
   };
 
-  nativeBuildInputs = [ extra-cmake-modules kdoctools ];
+  nativeBuildInputs = [ wrapGAppsHook extra-cmake-modules kdoctools ];
   buildInputs = [ kio libksane ];
 }