Fix ionos-dyndns timer interval

systemd uses min, not m for minutes.

nix/modules/ionos-dyndns.nix

@@ -73,7 +73,7 @@ in {
       };
       interval = mkOption {
         type = types.str;
-        default = "14m";
+        default = "14min";
         description = "How often to run the update script in systemd.timers notation.";
       };
       serviceName = mkOption {

nix/modules/spigot-server.nix

@@ -1,7 +1,6 @@
 { config, lib, pkgs, ... }:
 with lib;
 let
-  ionos-dyndns = pkgs.callPackage ../packages/ionos-dyndns.nix {};
   spigot-server = pkgs.callPackage ../packages/spigot-server.nix {};
   cfg = config.services.spigot-server;
   StateDirectory = "spigot-server";