Fix Sidekiq config syntax

Author: northeastprince

config/initializers/sidekiq.rb

@@ -6,7 +6,7 @@
 
   config.capsule("AWS SES") do |capsule| # avoid rate limits
     Rails.configuration.action_mailer.deliver_later_queue_name = "SES"
-    capsule.queue = "SES"
+    capsule.queues = ["SES"]
     capsule.concurrency = 2
   end
 end