Revert removal of waybar-hyprland overlay

overlays/default.nix

@@ -9,6 +9,14 @@
     '';
   };
 
+  waybar-hyprland = prev.waybar.overrideAttrs (old: {
+    pname = "${old.pname}-hyprland";
+    postPatch = old.postPatch or "" + ''
+      sed -i 's,zext_workspace_handle_v1_activate(workspace_handle_);,const std::string command = "${final.hyprland}/bin/hyprctl dispatch workspace " + name_;\n\tsystem(command.c_str());,g' src/modules/wlr/workspace_manager.cpp
+    '';
+    mesonFlags = old.mesonFlags or [ ] ++ [ "-Dexperimental=true" ];
+  });
+
   master = import inputs.master {
     inherit (prev) system;
     config.allowUnfree = true;