rubocop: fix various style issues.

config/environments/production.rb

@@ -51,7 +51,7 @@ Rails.application.configure do
   config.log_level = :error
 
   # Prepend all log lines with the following tags.
-  config.log_tags = [ :request_id ]
+  config.log_tags = [:request_id]
 
   # Use a different cache store in production.
   # config.cache_store = :mem_cache_store

config/environments/test.rb

@@ -5,7 +5,7 @@
 
 Rails.application.configure do
   # Settings specified here will take precedence over those in config/application.rb.
-  
+
   config.cache_classes = true
 
   # Do not eager load code on boot. This avoids loading your whole application