remove unused variable

Author: Nazar65

app/code/Magento/Cms/view/adminhtml/templates/browser/content/files.phtml

@@ -7,7 +7,6 @@
 /** @var $block \Magento\Cms\Block\Adminhtml\Wysiwyg\Images\Content\Files */
 
 $_width  = $block->getImagesWidth();
-$_height = $block->getImagesHeight();
 
 ?>
 <?php if ($block->getFilesCount() > 0) : ?>