Move AccountSlug::Extractor later in the stack

so that in development, it runs after reloading; but still before the
database selector middleware in case we ever want to do something
account-specific.

config/initializers/tenanting/account_slug.rb

@@ -44,5 +44,5 @@ module AccountSlug
 end
 
 Rails.application.config.middleware.tap do |stack|
-  stack.insert_before Rails::Rack::Logger, AccountSlug::Extractor
+  stack.insert_before ActiveRecord::Middleware::DatabaseSelector, AccountSlug::Extractor
 end