fixed the login button link

[adrianmcli]

I was having trouble with getting the nav button to redirect properly. I think this fixes it.

[splendido]

Hei @adrianmc,
yeah the atNavButton at the moment works only if you do a AccountsTemplates.configureRoute('atSignIn') leaving the route's name unchanged (atSingIn).

The solution you're proposing might create some problem in case it gets to this line being executed.

I'd say a better solution would be something like this line:

Router.go(AccountsTemplates.getRouteName('signIn'));

But still this will work only if you configured the sign in route with `AccountsTemplates.configureRoute'

Could you please update the this PR?

[adrianmcli]

I have updated it with your suggestion, thanks for the reply!

[splendido]

Great, tnx!