CBQE:0 Fix error in bucket_size in non-dgm cases

Change-Id: I32268745a455bfbee571cb356e5f41d48b1f0b57
Reviewed-on: http://review.couchbase.org/44363
Reviewed-by: Aruna Piravi <aruna@couchbase.com>
Tested-by: Aruna Piravi <aruna@couchbase.com>