Missing hyprqt6engine

[arkaitzsilva]

hyprqt6engine is currently not included in hyprnix.

Repo: https://github.com/hyprwm/hyprqt6engine

Since hyprnix lists the Hypr ecosystem projects, it seems this one is missing.

[fufexan]

It's missing because its only release was made before the Nix files were added. We'd need a new release for it to work.

[vaxerski]

@fufexan