title: Removing back arrow in navigation bar keeping back button title
body: <p>I have xamarin forms ios application,where I need to remove the back arrow in the navigation bar but the title should be displayed and when user clicks on on that back button title it should navigate to previous view.
   I tried using `</p>
  
  <pre><code>NavigationPage.SetBackButtonTitle(this, "Cancel");
  
  NavigationPage.SetHasBackButton(this, false);
  </code></pre>
  
  <p>But the back arrow is still displaying,is there any why to have only the text <code>Cancel</code> without <code>&lt;</code>symbol?</p>