*Don't* silence the deprecation warnings in test

This is actually where we are most likely to see it (and we should try to deal
with those as soon as possible, ideally when upgrading).

config/environments/test.rb

@@ -40,7 +40,5 @@ Discourse::Application.configure do
   config.assets.compile = true
   config.assets.digest = false
 
-  # silence deprecation warnings in test
   config.eager_load = false
-  ActiveSupport::Deprecation.silenced = true
 end