nixos-modules: hydra-queue-runner fix network-online.target eval warning

nixos-modules/hydra.nix

@@ -339,6 +339,7 @@ in
     systemd.services.hydra-queue-runner =
       { wantedBy = [ "multi-user.target" ];
         requires = [ "hydra-init.service" ];
+        wants = [ "network-online.target" ];
         after = [ "hydra-init.service" "network.target" "network-online.target" ];
         path = [ cfg.package pkgs.nettools pkgs.openssh pkgs.bzip2 config.nix.package ];
         restartTriggers = [ hydraConf ];