libadwaita: demo's desktop file is in out

[0n-s]

Describe the bug

The libadwaita demo application's binary is missing from the libadwaita package. Notably, only the binary is missing; e.g. the desktop file is there, & it obviously fails to launch.

The libadwaita demo's binary is in the devdoc output of libadwaita, but the desktop file for it is in out, resulting in a broken desktop file.

Steps To Reproduce

Steps to reproduce the behavior:

1. Install libadwaita.
2. It installs the desktop file for adwaita-1-demo, the actual binary for which is part of the devdoc output.

Expected behavior

The libadwaita demo application's desktop file should be packaged in the devdoc output.

Screenshots

If applicable, add screenshots to help explain your problem.

Additional context

Add any other context about the problem here.

Notify maintainers

@bobby285271 @hedning @jtojnar @dasj19 @amaxine @dotlambda

Metadata

Please run nix-shell -p nix-info --run "nix-info -m" and paste the result.

 - system: `"x86_64-linux"`
 - host os: `Linux 6.6.0-rc5, NixOS, 23.11 (Tapir), 23.11pre534806.5e4c2ada4fcd`
 - multi-user?: `yes`
 - sandbox: `yes`
 - version: `nix-env (Nix) 2.17.0`
 - channels(root): `"nixos"`
 - nixpkgs: `/nix/var/nix/profiles/per-user/root/channels/nixos`

[jtojnar]

It is part of the devdoc output. The desktop file should be moved there as well.

[0n-s]

My bad, I read the derivation wrong far too much...updated accordingly.