Revert "Merge pull request #9812 from chrspeich/hide-tabs-lone-auth-provider"

This reverts commit 84999611, reversing
changes made to 0d9fb211.

app/views/devise/shared/_signin_box.html.haml

@@ -7,7 +7,6 @@
       %h3 Sign in
   .login-body
     - if form_based_providers.any?
-      - if form_based_providers.count >= 2 || signin_enabled?
       %ul.nav.nav-tabs
         - if crowd_enabled?
           %li.active
@@ -28,13 +27,6 @@
         - if signin_enabled?
           %div#tab-signin.tab-pane
             = render 'devise/sessions/new_base'
-      - else
-        - if crowd_enabled?
-          = render 'devise/sessions/new_crowd'
-        - elsif @ldap_servers.any?
-          = render 'devise/sessions/new_ldap', server: @ldap_servers.first
-        - elsif signin_enabled?
-          = render 'devise/sessions/new_base'
 
     - elsif signin_enabled?
       = render 'devise/sessions/new_base'