Autoupdate option visible only for administrators group (#2945)

* Added isAdmin value to Settings.UI. Changed elevation check to user group check for AutoDownload toggle

src/core/Microsoft.PowerToys.Settings.UI/Views/ShellPage.xaml.cs

@@ -40,6 +40,8 @@ namespace Microsoft.PowerToys.Settings.UI.Views
 
         public static bool IsElevated { get; set; }
 
+        public static bool IsUserAnAdmin { get; set; }
+
         /// <summary>
         /// Initializes a new instance of the <see cref="ShellPage"/> class.
         /// Shell page constructor.
@@ -77,6 +79,11 @@ namespace Microsoft.PowerToys.Settings.UI.Views
             IsElevated = isElevated;
         }
 
+        public void SetIsUserAnAdmin(bool isAdmin)
+        {
+            IsUserAnAdmin = isAdmin;
+        }
+
         public void Refresh()
         {
             shellFrame.Navigate(typeof(GeneralPage));