Userland: Add horizontal mouse scroll support

Author: https://github.com/can3p
Commit: 1662213737
Pull-request: https://github.com/SerenityOS/serenity/pull/11246
Reviewed-by: https://github.com/kleinesfilmroellchen ✅

Userland/Libraries/LibGUI/SpinBox.cpp

@@ -87,7 +87,7 @@ void SpinBox::set_range(int min, int max, AllowCallback allow_callback)
 
 void SpinBox::mousewheel_event(MouseEvent& event)
 {
-    auto wheel_delta = event.wheel_delta() / abs(event.wheel_delta());
+    auto wheel_delta = event.wheel_delta_y() / abs(event.wheel_delta_y());
     if (event.modifiers() == KeyModifier::Mod_Ctrl)
         wheel_delta *= 6;
     set_value(m_value - wheel_delta);