Drop waybar and swaync from the desktop set

Both are marked 'kept as a reserve' in the Arch config, a note left over
from the migration to the Quickshell bar. A fresh setup has no reason to
carry them, so the packages, their configs and the waybar-only helper
scripts stay out.

modules/services.nix

@@ -80,9 +80,6 @@
       Type = "simple";
       ExecStartPre = "${pkgs.coreutils}/bin/sleep 2";
       ExecStart = "${lib.getExe pkgs.wlsunset} -T 6500 -t 5000 -S 00:00 -s 00:01";
-      # Leading '-' keeps a missing waybar non-fatal, otherwise pkill's exit 1
-      # fails the unit and Restart=on-failure spins it in a flicker loop.
-      ExecStartPost = "-${pkgs.procps}/bin/pkill -RTMIN+11 waybar";
       Restart = "on-failure";
       RestartSec = 3;
     };