hyprland: Start at workspace 5000000

This enables relative empty workspaces to always be created both before
and after the last occupied workspace.

home/hyprland.nix

@@ -31,6 +31,7 @@ in
     exec-once = sleep 0.5 && ironbar
     exec-once = fcitx5
     exec-once = mullvad-vpn
+    exec-once = hyprctl dispatch workspace 5000000
     exec-once = wl-paste -p --watch wl-copy -pc
     exec-once = ${pkgs.polkit_gnome}/libexec/polkit-gnome-authentication-agent-1