pinwheel: Set alex as tailscale operator

hosts/pinwheel/modules/tailscale/default.nix

@@ -1,6 +1,7 @@
 { pkgs, ... }:
 {
   services.tailscale.enable = true;
+  services.tailscale.extraSetFlags = [ "--operator=alex" ];
 
   # Pinned to 1.96.5. 1.98.0 regressed split-DNS handling under work-vpn: the
   # netmap's "resolve <tailnet>.ts.net locally via MagicDNS" hint is dropped