a single 'Cancel' button is usually left of a view controller accordi…

…ng to human interface guidelines (this issue became more obvious as 'Contact' is now the fist item in the attach menu)

deltachat-ios/Chat/Send Contact/SendContactViewController.swift

@@ -47,7 +47,7 @@ class SendContactViewController: UIViewController {
         setupConstraints()
 
         let cancelButton = UIBarButtonItem(barButtonSystemItem: .cancel, target: self, action: #selector(SendContactViewController.cancel(_:)))
-        navigationItem.rightBarButtonItem = cancelButton
+        navigationItem.leftBarButtonItem = cancelButton
 
         searchController.searchResultsUpdater = self
         navigationItem.searchController = searchController