Jump to thread table view when view appears

This fixes the issue where people can’t get past the navigation title

Mastodon/Scene/Thread/ThreadViewController.swift

@@ -105,6 +105,12 @@ extension ThreadViewController {
         tableView.deselectRow(with: transitionCoordinator, animated: animated)
     }
 
+    override func viewDidAppear(_ animated: Bool) {
+        super.viewDidAppear(animated)
+
+        UIAccessibility.post(notification: .screenChanged, argument: tableView)
+    }
+    
 }
 
 extension ThreadViewController {