Ensure closing notification is handled on the update thread

Author: VolcanicArts

VRCOSC.Desktop/Updater/SquirrelUpdateManager.cs

@@ -88,7 +88,7 @@ protected override async Task ApplyUpdatesAsync()
         }
         catch (Exception e)
         {
-            progressNotification.Hide();
+            progressNotification.Close();
 
             // Update may have failed due to the installed version being too outdated
             // Retry without trying for delta

VRCOSC.Game/Graphics/Notifications/Notification.cs

@@ -68,7 +68,9 @@ private void load()
 
     protected override bool OnClick(ClickEvent e)
     {
-        Hide();
+        Close();
         return true;
     }
+
+    public void Close() => Scheduler.Add(Hide);
 }