title: Yii2 Kartik fileinput Issue
body: <p>I have create a file input field in yii2 using kartik fileinput widget.Just see the code below</p>
  
  <pre><code>&lt;?=FileInput::widget([
      'name' =&gt; 'pictures[]',
      'pluginOptions' =&gt; [
          'showPreview' =&gt; false,
          'showCaption' =&gt; false,
          'showRemove' =&gt; false,
          'showUpload' =&gt; false,
          'browseClass' =&gt; 'btn btn-theme btn-lg btn-block',
          'browseIcon' =&gt; '&lt;i class="glyphicon glyphicon-camera"&gt;&lt;/i&gt; ',
          'browseLabel' =&gt;  'Select Photo'
      ],
      'options' =&gt; [
        'accept' =&gt; 'image/*',
        'multiple' =&gt; true],
  ]);
  </code></pre>
  
  <p>And here is my output<a href="https://i.stack.imgur.com/5c8Uz.jpg" rel="nofollow noreferrer"><img src="https://i.stack.imgur.com/5c8Uz.jpg" alt="enter image description here"></a></p>
  
  <p>How to hide the highlighted button.I mean cancel button</p>