Fix bounds and workarea on additional screen in macOS

Before this fix, the 'y' coordinate of the bounds and
the workarea of additional screens omitted the origin of
the main window.

Author: Gasparoken

os/osx/screen.h

@@ -1,5 +1,5 @@
 // LAF OS Library
-// Copyright (c) 2020-2021  Igara Studio S.A.
+// Copyright (c) 2020-2025  Igara Studio S.A.
 //
 // This file is released under the terms of the MIT license.
 // Read LICENSE.txt for more information.
@@ -23,14 +23,15 @@ class ScreenOSX : public Screen {
   {
     auto rc = screen.frame;
     auto wa = screen.visibleFrame;
+    const int mainScreenHeight = [NSScreen mainScreen].frame.size.height;
 
     m_bounds.x = rc.origin.x;
-    m_bounds.y = rc.origin.y;
+    m_bounds.y = mainScreenHeight - rc.origin.y - rc.size.height;
     m_bounds.w = rc.size.width;
     m_bounds.h = rc.size.height;
 
     m_workarea.x = wa.origin.x;
-    m_workarea.y = m_bounds.h - wa.origin.y - wa.size.height;
+    m_workarea.y = mainScreenHeight - wa.origin.y - wa.size.height;
     m_workarea.w = wa.size.width;
     m_workarea.h = wa.size.height;
   }