[NixOS] Enable picom vsync for machines other than ryzen-shine

nixos/options.nix

@@ -0,0 +1,8 @@
+{ lib, ... }: {
+  options = {
+    modules.xmonad.picom.vSync.enable = lib.makeOption {
+      default = true;
+      type = lib.types.bool;
+    };
+  };
+}