Fix handling of Web calendars

- handle Web calendars that require authentication;
- properly save the "reload on login" option;
- reload Web calendars when clicking on the reload button on top of the
  events/tasks list;
- properly activate the checkbox of new calendars (as they are enabled
  by default).

Fixes #3326

UI/WebServerResources/js/Common/Resource.service.js

@@ -77,10 +77,7 @@
     })
       .then(function(response) {
         return deferred.resolve(response.data);
-      }, function(response) {
-        if (response.status == 404)
-          return deferred.reject();
-      });
+      }, deferred.reject);
 
     return deferred.promise;
   };