Remove afterSignIn hook from actions in AuthRoute

This is a leftover from previous version of auth code. The purpose of
this code was to redirect to index if we're on auth route and user is
already signed in. This may happen only when we use autoSignIn which is
synchronuous, so it should be fine to just check if user is signed in
and redirect to index there.

assets/scripts/app/routes.coffee

@@ -407,10 +407,9 @@ Travis.AuthRoute = Travis.Route.extend
   deactivate: ->
     @controllerFor('auth').set('redirected', false)
 
-  actions:
-    afterSignIn: ->
+  redirect: ->
+    if @auth.get('signedIn')
       @transitionTo('index.current')
-      return true
 
 Travis.RepoSettingsRoute = Travis.Route.extend
   setupController: (controller, model) ->