OO-763 hide toolbar in ios by default

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

@@ -10,7 +10,8 @@
 <meta name="DC.type" content="Interactive Resource" scheme="DCTERMS.DCMIType" />
 <meta name="DC.identifier" content="http://www.openolat.org" scheme="DCTERMS.URI" />
 <meta name="DC.rights" content="http://www.openolat.org" />
-<meta name="viewport" content="width=device-width, initial-scale=1">
+## 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="cache-control" content="no-cache" />
 <meta http-equiv="pragma" content="no-cache" />