setup observers before initial UI update is triggered

deltachat-ios/Controller/ContactDetailViewController.swift

@@ -123,9 +123,9 @@ class ContactDetailViewController: UITableViewController {
 
     override func viewWillAppear(_ animated: Bool) {
         super.viewWillAppear(animated)
+        setupObservers()
         updateHeader() // maybe contact name has been edited
         updateCellValues()
-        setupObservers()
         tableView.reloadData()
     }
 

deltachat-ios/Controller/GroupChatDetailViewController.swift

@@ -212,10 +212,10 @@ class GroupChatDetailViewController: UIViewController {
         updateGroupMembers()
         tableView.reloadData() // to display updates
         editBarButtonItem.isEnabled = currentUser != nil
+        setupObservers()
         updateHeader()
         updateMediaCellValues()
         updateEphemeralTimerCellValue()
-        setupObservers()
     }