OO-1440: always use the current version of the rendering engine of IE

src/main/java/org/olat/core/commons/fullWebApp/_content/fullwebapplayout.html

@@ -13,6 +13,7 @@
 ## hide toolbar on ios with minimal-ui
 <meta name="viewport" content="minimal-ui, width=device-width, initial-scale=1">
 <meta http-equiv="Content-type" content="text/html; charset=utf-8" />
+<meta http-equiv="X-UA-Compatible" content="IE=edge" />
 ## <!-- IE cache -->
 <script type="text/javascript">
 /* <![CDATA[ */