Make tlater part of the wheel group again

Trying to go sudo-less immediately was probably a bit too
ambitious. Once we have a working continuous deployment setup this may
be applied again.

etc/nixos/configuration.nix

@@ -41,7 +41,7 @@
   users.users = {
     tlater = {
       isNormalUser = true;
-      extraGroups = [ "docker" ];
+      extraGroups = [ "wheel" "docker" ];
       openssh.authorizedKeys.keyFiles = [ ./keys/tlater.pub ];
     };
   };