remove preventXss against to raw-text-original (this will be removed by ReactDOM rendering)

src/server/views/widget/page_content.html

@@ -46,7 +46,7 @@
   {% include 'page_alerts.html' %}
 
   <div id="display-switcher">
-    <script type="text/template" id="raw-text-original">{{ revision.body.toString() | preventXss | encodeHTML }}</script>
+    <script type="text/template" id="raw-text-original">{{ revision.body.toString() | encodeHTML }}</script>
   </div>
   <div id="page-editor-navbar-bottom-container" class="d-none d-edit-block"></div>
 </div>