Merge pull request #19052 from unoplatform/dev/mazi/traits

fix: Observe specific trait on RootViewController

src/Uno.UI/Controls/RootViewController.iOS.cs

@@ -65,7 +65,7 @@ private void Initialize()
 			// iOS 17+ only
 			if (UIDevice.CurrentDevice.CheckSystemVersion(17, 0))
 			{
-				((IUITraitChangeObservable)this).RegisterForTraitChanges((env, traits) => SystemThemeHelper.RefreshSystemTheme());
+				((IUITraitChangeObservable)this).RegisterForTraitChanges((env, traits) => SystemThemeHelper.RefreshSystemTheme(), typeof(UITraitUserInterfaceStyle));
 			}
 #endif
 		}