Fix the “no matches” optimization

When the subgroup doesn’t exist, this will now return false as soon as the “Sorry” text appears, instead of waiting for the default Capybara wait time.

qa/qa/page/group/show.rb

@@ -28,11 +28,9 @@ module QA
         def has_subgroup?(name)
           filter_by_name(name)
 
-          wait(reload: false) do
-            break false if page.has_content?('Sorry, no groups or projects matched your search')
+          page.has_text?(/#{name}|Sorry, no groups or projects matched your search/, wait: 60)
 
-            page.has_link?(name)
-          end
+          page.has_text?(name, wait: 0)
         end
 
         def go_to_new_subgroup