Caldav: change user agent test to include all iOS versions

git-svn-id: http://svn.code.sf.net/p/davmail/code/trunk@2179 3d1905a2-6b24-0410-a738-b14d5a86fcbd

src/java/davmail/caldav/CaldavConnection.java

@@ -1448,7 +1448,7 @@ public class CaldavConnection extends AbstractConnection {
         }
 
         protected boolean isIcal5() {
-            return isUserAgent("CoreDAV/") || isUserAgent("iOS/5") || isUserAgent("iOS/6")
+            return isUserAgent("CoreDAV/") || isUserAgent("iOS/")
                     // iCal 6
                     || isUserAgent("Mac OS X/10.8");
         }