fix gnome; swap to appindicator

configuration/modules/gnome.nix

@@ -1,4 +1,4 @@
-{ pkgs, lib, ... }:
+{ pkgs, config, lib, ... }:
 with lib;
 {
   options.gnome.tablet = mkOption {
@@ -19,7 +19,7 @@ with lib;
     environment.gnome.excludePackages = with pkgs; [ gnome-tour gnome-user-docs ];
 
     environment.systemPackages = with pkgs.gnomeExtensions; [
-      tray-icons-reloaded
+      appindicator
     ] ++ optionals config.gnome.tablet [
       touchup
     ];