Improve abstraction of deployment keys

modules/clightning.nix

@@ -5,7 +5,7 @@ with lib;
 let
   cfg = config.services.clightning;
   configFile = pkgs.writeText "config" ''
-    autolisten=${toString cfg.autolisten}
+    autolisten=${if cfg.autolisten then "true" else "false"}
     network=bitcoin
     bitcoin-rpcuser=${cfg.bitcoin-rpcuser}
   '';

modules/nixbitcoin.nix

@@ -116,10 +116,6 @@ in {
         type = "oneshot";
       };
     };
-    # This is required to have the deployment keys copied and chowned even if
-    # nanopos is not enabled
-    users.users.nanopos = {};
-    users.groups.nanopos = {};
 
     services.liquidd.enable = cfg.modules == "all";
     services.lightning-charge.enable = cfg.modules == "all";