restrict VoiceOver to read chat list title as title, not additionally as a button, the accessibility hint informs already about the tap action

deltachat-ios/Controller/ChatListController.swift

@@ -26,6 +26,7 @@ class ChatListController: UITableViewController {
         view.addGestureRecognizer(navTapGesture)
         view.isUserInteractionEnabled = true
         view.font = UIFont.systemFont(ofSize: 17, weight: .semibold)
+        view.accessibilityTraits = .header
         return view
     }()