Title Bar height fix (#1620)

Changed the height of the Title Bar caption buttons (minimize, maximize,
close) from 32px to 48px so it matches the height of the AppTitleBar
UIElement.

## Description
Set the PreferredHeightOption of the Title Bar to Tall.

## Motivation and Context
The current caption buttons look weird. The fix is also just one line.
## Screenshots:

![image](https://github.com/user-attachments/assets/65e75644-6c5e-489a-a56f-9778c67c405f)

WinUIGallery/Navigation/NavigationRootPage.xaml.cs

@@ -102,6 +102,7 @@ public NavigationRootPage()
 
                 AppWindow appWindow = WindowHelper.GetAppWindow(window);
                 appWindow.SetIcon("Assets/Tiles/GalleryIcon.ico");
+                appWindow.TitleBar.PreferredHeightOption = TitleBarHeightOption.Tall;
                 _settings = new UISettings();
                 _settings.ColorValuesChanged += _settings_ColorValuesChanged; // cannot use FrameworkElement.ActualThemeChanged event because the triggerTitleBarRepaint workaround no longer works
             };