Only include WaitForAjax for :js specs

Signed-off-by: Rémy Coutable <remy@rymai.me>

spec/spec_helper.rb

@@ -36,7 +36,7 @@ RSpec.configure do |config|
   config.include LoginHelpers, type: :feature
   config.include SearchHelpers, type: :feature
   config.include WaitForRequests, :js
-  config.include WaitForAjax, type: :feature
+  config.include WaitForAjax, :js
   config.include StubConfiguration
   config.include EmailHelpers, type: :mailer
   config.include TestEnv