MAGETWO-44677: Add if IE check to Category Widget Tree template

Author: Dmytro Poperechnyy

app/code/Magento/Catalog/view/adminhtml/templates/catalog/category/widget/tree.phtml

@@ -10,8 +10,9 @@
 
 <?php $_divId = 'tree' . $block->getId() ?>
 <div id="<?php /* @escapeNotVerified */ echo $_divId ?>" class="tree"></div>
+<!--[if IE]>
 <script id="ie-deferred-loader" defer="defer" src=""></script>
-<![]-->
+<![endif]-->
 <script>
 require(['jquery', "prototype", "extjs/ext-tree-checkbox"], function(jQuery){