fix a typo in logout for session, should be delete, found out after writing integ test
fix a typo in logout for session, should be delete, found out after writing integ test

papertrading/PaperTrading,papertrading/PaperTrading,gVien/PaperTrading,gVien/PaperTrading,papertrading/PaperTrading,gVien/PaperTrading