MB-11433 take off the shadow/gray background on the "other" section

... of UPR stats, since it makes it look like it is a total when it really isn't

Change-Id: Ib0747eaaf8ce46ad7050f8d3237a1c9739af11bf
Reviewed-on: http://review.couchbase.org/38819
Tested-by: Artem Stemkovski <artem@couchbase.com>
Reviewed-by: Aliaksey Kandratsenka <alkondratenko@gmail.com>