title: template_name in LogoutView not working on django2.1 python3.7
body: <p>Below is default setting in django.contrib.auth.views.LogoutViews, </p>
  
  <pre><code>template_name = 'registration/logged_out.html'
  </code></pre>
  
  <p>i configurate my app's urls.py like this:</p>
  
  <pre><code>from django.urls import path
  from . import views
  
  from django.conf import settings
  
  from django.contrib.auth.views import LoginView, LogoutView
  
  app_name = 'account'
  urlpatterns = [
      #path("login/", views.user_login, name="user_login"),
      path("login/", LoginView.as_view(), name="user_login"),
      path("nlogin/", LoginView.as_view(), {"template_name":"account/login.html"}),
      path("logout/", LogoutView.as_view(), name="user_logout"),
      path("logoutt/", LogoutView.as_view(), {"template_name":"account/logout.html"}),
  ]
  </code></pre>
  
  <p>"template_name":"account/login.html" works properly, but "template_name":"account/logout.html" seems make no difference, what's wrong with my code?</p>