Userland: Let applications make use of make_command_palette_action()

Author: https://github.com/demostanis
Commit: 34acae90c7
Pull-request: https://github.com/SerenityOS/serenity/pull/15596
Reviewed-by: https://github.com/alimpfard
Reviewed-by: https://github.com/linusg

Userland/Applications/ImageViewer/main.cpp

@@ -329,6 +329,7 @@ ErrorOr<int> serenity_main(Main::Arguments arguments)
     TRY(view_menu->try_add_action(hide_show_toolbar_action));
 
     auto help_menu = TRY(window->try_add_menu("&Help"));
+    TRY(help_menu->try_add_action(GUI::CommonActions::make_command_palette_action(window)));
     TRY(help_menu->try_add_action(GUI::CommonActions::make_help_action([](auto&) {
         Desktop::Launcher::open(URL::create_with_file_scheme("/usr/share/man/man1/ImageViewer.md"), "/bin/Help");
     })));