Resolve "Default sidekiq queues to the in-image default"

To solve #668 (closed), allow the sidekiq chart to pull in the contents of the upstream sidekiq_queues.yml fro within the container, if pod[].queues is nil/empty

• Move :queues: definition to the top of the configmap-queue.yaml, due to the nature of to_yaml function outputting --- document seperator.
• If x.queues is empty, populate from the container's /srv/gitlab/config/sidekiq_queues.yml within the ERB, before overwriting in set-config
• Remove the default queues entry from sidekiq/values.yaml

Closes #668 (closed)