delete lazy code in viewmodels

src/Shared/HandyControlDemo_Shared/ViewModel/Controls/SpriteDemoViewModel.cs

@@ -1,5 +1,4 @@
-using System;
-using GalaSoft.MvvmLight.Command;
+using GalaSoft.MvvmLight.Command;
 using HandyControl.Controls;
 using HandyControlDemo.UserControl;
 
@@ -7,7 +6,6 @@ namespace HandyControlDemo.ViewModel
 {
     public class SpriteDemoViewModel
     {
-        public RelayCommand OpenCmd => new Lazy<RelayCommand>(() =>
-            new RelayCommand(() => Sprite.Show(new AppSprite()))).Value;
+        public RelayCommand OpenCmd => new(() => Sprite.Show(new AppSprite()));
     }
 }