MB-36923: Use correct value for num_writer_thread listener
MB-36923: Use correct value for num_writer_thread listener

Fix typo in the config change listener for num_writer_threads - use
getNumReaderThreads(), not getNumWriterThreads().

Change-Id: If5332d453d0abf1d27f4c63dbcc1a27acd206bc0
Reviewed-on: http://review.couchbase.org/118448
Well-Formed: Build Bot <80754af91bfb6d1073585b046fe0a474ce868509@couchbase.com>
Reviewed-by: Trond Norbye <60edd2ef23891a753f231b0c6f161dc634079a93@couchbase.com>
Tested-by: Build Bot <80754af91bfb6d1073585b046fe0a474ce868509@couchbase.com>

daverigby/kv_engine,daverigby/kv_engine,daverigby/kv_engine,daverigby/kv_engine