Summary:
When using two_write_queue, the published seq and the last allocated sequence could be ahead of the LastSequence, even if both write queues are stopped as in WriteRecoverableState. The patch fixes a bug in WriteRecoverableState in which LastSequence was used as a reference but the result was applied to last fetched sequence and last published seq.
Closes https://github.com/facebook/rocksdb/pull/3665

Differential Revision: D7446099

Pulled By: maysamyabandeh

fbshipit-source-id: 1449bed9aed8e9db6af85946efd347cb8efd3c0b