Fix intray server config syntax error

hosts/nixos/lapetus/services/intray.nix

@@ -10,7 +10,7 @@ in
   # {{{ Import intray module 
   imports = [
     # We patch out the `intray` module to allow manual configuration for nginx
-    a:
+    (a:
       # NOTE: using `pkgs.system` before `module.options` is evaluated
       # leads to infinite recursion!
       let m = inputs.intray.nixosModules.x86_64-linux.default a;
@@ -18,7 +18,7 @@ in
       {
         inherit (m) options;
         config = { inherit (m.config) systemd; };
-    }
+      })
   ];
   # }}}
   # {{{ Configure intray