MB-8998: fixed server status icon

Change-Id: I67d462b56b8972257c1eb34d29599310d3eea8f0
Reviewed-on: http://review.couchbase.org/29168
Reviewed-by: Artem Stemkovski <artem@couchbase.com>
Tested-by: Artem Stemkovski <artem@couchbase.com>