Typo on PdoSessionHandler

[eduluz1976]

I observed that sometimes my DB has displayed errors like:

2019-10-30 14:32:20.701 UTC 10.162.0.17(44298)ERROR: syntax error at or near "WHERE" at character 14 2019-10-30 14:32:20.701 UTC 10.162.0.17(44298)STATEMENT: DELETE FROM WHERE last_activity <= 1572444500

The "DELETE FROM

", where comes empty.
Looking at the code, I observed that on 'gc' and 'destroy' methods have a typo. Instead use '$this->tablename', is '$this->table'.