Fixing an issue where doing folder config on account does not refresh the folder list.

Wino.Messages/Client/Accounts/AccountFolderConfigurationUpdated.cs

@@ -0,0 +1,9 @@
+using System;
+
+namespace Wino.Messaging.Client.Accounts
+{
+    /// <summary>
+    /// When account's special folder configuration is updated.
+    /// </summary>
+    public record AccountFolderConfigurationUpdated(Guid AccountId);
+}