baobab: fix missing dconf module

[Mic92]

fix Using the 'memory' GSettings backend

@abbradar this seems to be a common missed dependency in gtk apps. Can we make gsettings_desktop_schemas also providing dconf by default?

Related to #24602

Things done

• Tested using sandboxing
  (nix.useSandbox on NixOS,
  or option build-use-sandbox in nix.conf
  on non-NixOS)
• Built on platform(s)
  • NixOS
  • macOS
  • Linux
• Tested compilation of all pkgs that depend on this change using nix-shell -p nox --run "nox-review wip"
• Tested execution of all binary files (usually in ./result/bin/)
• Fits CONTRIBUTING.md.

---

[abbradar]

dconf is not needed when wrapGAppsHook is used: https://github.com/NixOS/nixpkgs/blob/master/pkgs/top-level/all-packages.nix#L328

BTW, gsettings_desktop_schemas are not usually needed -- they contain only GNOME3-specific schemas which most applications do not need. Most of the time only schemas from gtk3 are needed so the problem is that application is not wrapped with wrapGAppsHook.

EDIT: we have a lot of unneeded gsettings_desktop_schemas usage in nixpkgs because of misleading error message "No GSettings schemas found".

[Mic92]

ok. now it works