session-worker: Set session_vt=0 out of pam uninitialization
MR !123 (merged) moved jump_to_vt and session_vt reseting to a separate function, so we don't need to reset session_vt in pam uninitialization.
MR !123 (merged) moved jump_to_vt and session_vt reseting to a separate function, so we don't need to reset session_vt in pam uninitialization.