[1.8.x] Sorted imports with isort; refs #23860.

Backport of 0ed7d15563 from master

tests/urlpatterns_reverse/extra_urls.py

@@ -2,11 +2,10 @@
 Some extra URL patterns that are included at the top level.
 """
 
-from django.conf.urls import url, include
+from django.conf.urls import include, url
 
 from .views import empty_view
 
-
 urlpatterns = [
     url(r'^e-places/([0-9]+)/$', empty_view, name='extra-places'),
     url(r'^e-people/(?P<name>\w+)/$', empty_view, name="extra-people"),