set vsync = true; setting it false seems to cause crashes on UWP

GitOrigin-RevId: 6f30cefcaa

Shared/SneakGame.cs

@@ -28,7 +28,8 @@ namespace SemiColinGames {
 
     public SneakGame() {
       graphics = new GraphicsDeviceManager(this) {
-        SynchronizeWithVerticalRetrace = false
+        SynchronizeWithVerticalRetrace = true,
+        GraphicsProfile = GraphicsProfile.HiDef
       };
       IsFixedTimeStep = true;
       TargetElapsedTime = TimeSpan.FromSeconds(1.0 / 60);