nixos/prometheus-smartctl-exporter: providing the path to the binary is no longer needed

nixos/modules/services/monitoring/prometheus/exporters/smartctl.nix

@@ -2,20 +2,23 @@
 
 let
   cfg = config.services.prometheus.exporters.smartctl;
+
   inherit (lib) mkOption types literalExpression;
+
   args = lib.escapeShellArgs ([
     "--web.listen-address=${cfg.listenAddress}:${toString cfg.port}"
-    "--smartctl.path=${pkgs.smartmontools}/bin/smartctl"
     "--smartctl.interval=${cfg.maxInterval}"
   ] ++ map (device: "--smartctl.device=${device}") cfg.devices
   ++ cfg.extraFlags);
-in {
+
+in
+{
   port = 9633;
 
   extraOpts = {
     devices = mkOption {
       type = types.listOf types.str;
-      default = [];
+      default = [ ];
       example = literalExpression ''
         [ "/dev/sda", "/dev/nvme0n1" ];
       '';
@@ -24,6 +27,7 @@ in {
         all disks if none given.
       '';
     };
+
     maxInterval = mkOption {
       type = types.str;
       default = "60s";
@@ -50,9 +54,7 @@ in {
         "block-sd rw"
         "char-nvme rw"
       ];
-      ExecStart = ''
-        ${pkgs.prometheus-smartctl-exporter}/bin/smartctl_exporter ${args}
-      '';
+      ExecStart = "${pkgs.prometheus-smartctl-exporter}/bin/smartctl_exporter ${args}";
       PrivateDevices = lib.mkForce false;
       ProtectProc = "invisible";
       ProcSubset = "pid";