Fix url stored in LoadRequest

The test_urlProperty() qml test has failed because the active url was
stored in LoadRequest in case of LoadFailedStatus.
With this fix the loadRequest stores the url of that page which implies
the request.

Change-Id: I6aab814a4a7d3b47043b03fccde3d9995b40d8fa
Reviewed-by: Pierre Rossi <pierre.rossi@gmail.com>