Update login views for two-factor auth

app/views/devise/sessions/_new_base.html.haml

 = form_for(resource, as: resource_name, url: session_path(resource_name)) do |f|
   = f.text_field :login, class: "form-control top", placeholder: "Username or Email", autofocus: "autofocus"
   = f.password_field :password, class: "form-control bottom", placeholder: "Password"
-  = f.hidden_field :otp_attempt, value: ''
   - if devise_mapping.rememberable?
     .remember-me.checkbox
       %label{for: "user_remember_me"}

app/views/devise/sessions/two_factor.html.haml

@@ -7,10 +7,7 @@
         - if @error
           .alert.alert-danger
             = @error
-        .hide
-          = f.text_field :login, class: "form-control top", placeholder: "Username or Email", autofocus: "autofocus"
-          = f.password_field :password, class: "form-control bottom", placeholder: "Password"
-        = f.text_field :otp_attempt, class: 'form-control',
-          placeholder: 'Two-factor authentication token', required: true, autofocus: true
+        = f.hidden_field :login
+        = f.text_field :otp_attempt, class: 'form-control', placeholder: 'Two-factor authentication code', required: true, autofocus: true
         .prepend-top-20
           = f.submit "Verify code", class: "btn btn-save"