flake: allow extra QT packages in dms-shell package

[LuckShiba]

This allows users to, optionally, add extra QT packages in dms-shell wrapper variables. This is useful for some QT packages some plugins may need, such as qtwebsockets in #1892.

Example usage:

{
  programs.dank-material-shell.package = dmsPkgs.dms-shell.override {
    extraQtPackages = with pkgs.kdePackages; [ qtwebsockets ];
  };
}

[djmaze]

Mhh.. Somehow with this approach, the HomeAssistant plugin again reports "Missing dependency". Not sure if this because I was using the stable version before.

UPDATE: No, was using the same DMS / Quickshell version of course. Will have a look what I am doing wrong.

[LuckShiba]

@djmaze, have you used the kdePackages.qtwebsockets and restarted your DMS after rebuilding? I just tested on my system, and adding qtwebsockets the same way as in the example in the description here got rid of the "Missing dependency" warning 😕

Run grep qtwebsockets $(which dms) and tell me if it has the qtwebsockets paths on it, it should have.