Revert "Fixes ispconfig/ispconfig3#3943"

A. Täffner

2016-06-14 b8942a6e3ac3786d82d4ab5f1c340028c29e9d62

1
ALTER TABLE  `sys_session` CHANGE  `session_id`  `session_id` VARCHAR( 64 ) CHARACTER SET latin1 COLLATE latin1_swedish_ci NOT NULL;