adding HA queue mirroring option

this whole if is badly indented, and reads super awkward.
Can we please do it like this:
```puppet
  if $rabbitmq::config_mirrored_queues {
    $policy_title = 'HA'
    $policy_vhost = '/'
  } else {
    $policy_title = 'HA2'
    $policy_vhost = $rabbitmq::vhost
  }
  rabbitmq::policy { $policy_vhost:
    pattern => '^(?!amq\.).*',
    vhost => $policy_vhost,
    definition => '{"ha-mode":"exactly","ha-params":2,"ha-sync-mode":"automatic"}'
  }
```