Hide jump to unread button on threads, override scroll to bottom action, fix #5264

Riot/Modules/Threads/Thread/ThreadViewController.swift

@@ -74,6 +74,10 @@ class ThreadViewController: RoomViewController {
         //  no-op
     }
     
+    override func scrollToBottomAction(_ sender: Any) {
+        scrollBubblesTableViewToBottom(animated: true)
+    }
+    
     private func showThreadActions() {
         let alertController = UIAlertController(title: nil, message: nil, preferredStyle: .actionSheet)