Remove trailing comma from enum

Sergey first pointed this out in a previous changeset..

Change-Id: I6f73015f81cfc5e6cbb0d7c86688d05920a0cde1
Reviewed-on: http://review.couchbase.org/44206
Tested-by: Mark Nunberg <mnunberg@haskalah.org>
Reviewed-by: Sergey Avseyev <sergey.avseyev@gmail.com>