Fix compile warnings

src/Ryujinx/Headless/Windows/WindowBase.cs

@@ -161,8 +161,6 @@ namespace Ryujinx.Headless
             }
         }
 
-        private StatusUpdatedEventArgs _lastStatus;
-
         private void InitializeWindow()
         {
             var activeProcess = Device.Processes.ActiveApplication;

src/Ryujinx/UI/Windows/MainWindow.axaml.cs

@@ -138,7 +138,7 @@ namespace Ryujinx.Ava.UI.Windows
 
             NotificationHelper.SetNotificationManager(this);
 
-            ShowIntelMacWarningAsync();
+            Executor.ExecuteBackgroundAsync(ShowIntelMacWarningAsync);
         }
 
         private void OnScalingChanged(object sender, EventArgs e)