nixos/nagios: use the correct option to restart on config change

X-ReloadIfChanged is incorrect, apparently https://github.com/NixOS/nixpkgs/pull/120324#discussion_r619472321
We restart instead of reloading because nagios unit file has no
ExecReload.

Changed files
+1 -1
nixos
modules
services
monitoring
+1 -1
nixos/modules/services/monitoring/nagios.nix
···
path = [ pkgs.nagios ] ++ cfg.plugins;
wantedBy = [ "multi-user.target" ];
after = [ "network.target" ];
+
restartTriggers = [ nagiosCfgFile ];
serviceConfig = {
User = "nagios";
···
LogsDirectory = "nagios";
StateDirectory = "nagios";
ExecStart = "${pkgs.nagios}/bin/nagios /etc/nagios.cfg";
-
X-ReloadIfChanged = nagiosCfgFile;
};
};