MB-10730 Fix definition of a upr status code atom

Fixed an incorrect mapping of response status code to atom.

Change-Id: I2253514168f75c472c10f5fd081fcd18ecd19e1e
Reviewed-on: http://review.couchbase.org/35322
Reviewed-by: Volker Mische <volker.mische@gmail.com>
Reviewed-by: Sarath Lakshman <sarath@couchbase.com>
Tested-by: Sarath Lakshman <sarath@couchbase.com>