nixos/network-interfaces-systemd: remove unused arg in genericDhcpNetworks

The first argument is not used (anymore).

nixos/modules/tasks/network-interfaces-systemd.nix

@@ -53,9 +53,7 @@ let
     )
   );
 
-  genericDhcpNetworks =
-    initrd:
-    mkIf cfg.useDHCP {
+  genericDhcpNetworks = mkIf cfg.useDHCP {
     networks."99-ethernet-default-dhcp" = {
       matchConfig = {
         Type = "ether";
@@ -220,7 +218,7 @@ in
       # former, the user retains full control over the configuration.
       boot.initrd.systemd.network = mkMerge [
         defaultGateways
-        (genericDhcpNetworks true)
+        genericDhcpNetworks
         interfaceNetworks
         bridgeNetworks
         vlanNetworks
@@ -271,7 +269,7 @@ in
           enable = true;
         }
         defaultGateways
-        (genericDhcpNetworks false)
+        genericDhcpNetworks
         interfaceNetworks
         bridgeNetworks
         (mkMerge (