Use same database for queue

This partly reverts 658ea7d7.

The configuration was added by solid_queue:install but we are using the
same database for storage and queue.

config/environments/production.rb

@@ -75,7 +75,6 @@ Rails.application.configure do
 
   # Use a real queuing backend for Active Job (and separate queues per environment).
   config.active_job.queue_adapter = :solid_queue
-  config.solid_queue.connects_to = { database: { writing: :queue } }
   # config.active_job.queue_name_prefix = "re_scheduled_production"
 
   config.action_mailer.perform_caching = false