Let Windows decide initial Settings window size

This makes it more native and prevents overly large/small window on screens with different scaling levels.

Author: danielchalmers

DesktopClock/Properties/Settings.cs

@@ -347,15 +347,15 @@ private Settings()
     /// <remarks>
     /// This remembers how wide you last made the settings window so it feels familiar the next time you open it.
     /// </remarks>
-    public double SettingsWindowWidth { get; set; } = 1200;
+    public double SettingsWindowWidth { get; set; } = double.NaN;
 
     /// <summary>
     /// Persisted height of the settings window.
     /// </summary>
     /// <remarks>
     /// This remembers how tall you last made the settings window so you do not have to resize it every time.
     /// </remarks>
-    public double SettingsWindowHeight { get; set; } = 900;
+    public double SettingsWindowHeight { get; set; } = double.NaN;
 
     /// <summary>
     /// Persisted vertical scroll offset of the settings window.