Splat the tag names to avoid passing double arrays

Author: amatsuda

railties/lib/rails/rack/logger.rb

@@ -21,7 +21,7 @@ def call(env)
         request = ActionDispatch::Request.new(env)
 
         if logger.respond_to?(:tagged)
-          logger.tagged(compute_tags(request)) { call_app(request, env) }
+          logger.tagged(*compute_tags(request)) { call_app(request, env) }
         else
           call_app(request, env)
         end