Change the method have_css for find

The old method have_css didn't wait, apparently,
the Capybara's max_wait_time.
It has been changed in favor of find,
one that waits the stablished time for
an element to appear in the screen.

spec/features/moderation/debates_spec.rb

@@ -25,7 +25,7 @@ feature 'Moderate debates' do
       click_link 'Hide'
     end
 
-    expect(page).to have_css("#debate_#{debate.id}.faded")
+    expect(find("div#debate_#{debate.id}.faded")).to have_text debate.title
 
     login_as(citizen)
     visit debates_path