nixos: add pathes for KDE applications

nixos/modules/config/system-path.nix

···
         "/share/themes"
         "/share/vim-plugins"
         "/share/vulkan"
+        "/share/kservices5"
+        "/share/kservicetypes5"
+        "/share/kxmlgui5"
       ];
 
     system.path = pkgs.buildEnv {