support blur window in core3

src/Shared/HandyControlDemo_Shared/App.xaml.cs

@@ -26,9 +26,8 @@ namespace HandyControlDemo
                 UpdateSkin(GlobalData.Config.Skin);
             }
 
-#if !Core
             ConfigHelper.Instance.SetSystemVersionInfo(CommonHelper.GetSystemVersionInfo());
-#endif
+
             ServicePointManager.SecurityProtocol = (SecurityProtocolType)(SslProtocols)0x00000C00;
         }
 

src/Shared/HandyControlDemo_Shared/Tools/Helper/CommonHelper.cs

@@ -1,5 +1,4 @@
-#if !Core
-using System.Linq;
+using System.Linq;
 using System.Management;
 using HandyControl.Data;
 
@@ -23,5 +22,4 @@ namespace HandyControlDemo.Tools
             return default(SystemVersionInfo);
         }
     }
-}
-#endif
+}