title: How to configure dxFileUploader to show up like a simple button?
body: <p>I have a dxFileUploader: </p>
  
  <pre><code>&lt;div data-bind="dxFileUploader: { buttonText: 'Select file', labelText: 'Drop file here', accept: 'image/*' }"&gt;&lt;/div&gt;
  </code></pre>
  
  <p>On the UI I got a surrounding white area (div).</p>
  
  <p>How to get rid of it? 
  I need only a simple button with an icon and no text that looks like this:</p>
  
  <pre><code>&lt;div data-bind="dxButton: { icon: 'arrowup' }"&gt;&lt;/div&gt;
  </code></pre>