include displayed link action if connected or not

[sgtHerbert]

https://github.com/FriendsOfSymfony/FOSUserBundle/blob/4125505ba6eba82ddf944378a3d636081c06da0c/Resources/views/Security/login.html.twig#L1 it seems strange to include the interface logic checker and text indication on the base login page. Indeed when a user arrives on "Login" Page, it feels confusing to have an action link "connexion" redirecting on the same page.