Move to focusworkspaceoncurrentmonitor (from custom script)

For a long time now, I've been using a custom shell script to handle
focusing to a workspace, which handled (xmonad-like) monitor swapping.

However recently, the option `focusworkspaceoncurrentmonitor` has been
added to Hyprland, which does the exact same. That means the script is
no longer necessary and we can move to the new built-in option.

home/programs/graphical/wms/hyprland/default.nix

@@ -16,7 +16,6 @@ in {
 
   config = mkIf cfg.enable {
     home.packages = [
-      hyprPkgs.hyprland-swap-workspace
       hyprPkgs.hyprland-move-window
       pkgs.brightnessctl
       hyprPkgs.brightness