refactor: remove old stuff

src/modules/backlight.cpp

@@ -175,11 +175,6 @@ auto waybar::modules::Backlight::update() -> void {
       return;
     }
 
-    // Run user-provided update handler if configured
-    if (config_["on-update"].isString()) {
-      AModule::update();
-    }
-
     const auto percent = best->get_max() == 0 ? 100 : best->get_actual() * 100 / best->get_max();
     label_.set_markup(fmt::format(
         format_, fmt::arg("percent", std::to_string(percent)), fmt::arg("icon", getIcon(percent))));