Fix QA page refresh address by using absolute URLs

This makes QA page refresh address to be absolute URL since we dropped
`Capybara.app_host`, thus there is no support for relative URLs with
`visit` now.

qa/qa/page/base.rb

@@ -5,7 +5,7 @@ module QA
       include Scenario::Actable
 
       def refresh
-        visit current_path
+        visit current_url
       end
     end
   end