Remove unnecessary changes

app/workers/concerns/object_storage_queue.rb

-# Concern for setting Sidekiq settings for the various GitLab ObjectStorage workers.
-module ObjectStorageQueue
-  extend ActiveSupport::Concern
-
-  included do
-    queue_namespace :object_storage
-  end
-end

spec/workers/concerns/object_storage_queue_spec.rb

-require 'spec_helper'
-
-describe ObjectStorageQueue do
-  let(:worker) do
-    Class.new do
-      def self.name
-        'DummyWorker'
-      end
-
-      include ApplicationWorker
-      include ObjectStorageQueue
-    end
-  end
-
-  it 'sets a default object storage queue automatically' do
-    expect(worker.sidekiq_options['queue'])
-      .to eq 'object_storage:dummy'
-  end
-end