title: belongs_to changes header in activeadmin
body: <p>I have a model names <code>goods</code> that can have <code>assets</code>. The assets can be accessed via the sidebar:</p>
  
  <p><img src="https://i.stack.imgur.com/rDs7o.png" alt="Goods Model"></p>
  
  <p>For reasons I do not know does the menu change, when i enter the assets section:</p>
  
  <p><img src="https://i.stack.imgur.com/aNqL7.png" alt="enter image description here"></p>
  
  <p>I want the menu to be the same, no matter where the user is. It's my navigation bar.</p>
  
  <p>Is this a bug or a feature? Can I change the behaviour?</p>