Revert "Remove pointless data copy in lockscreen delegate"

Authored by broulik on Oct 11 2017, 2:03 PM.

Description

Revert "Remove pointless data copy in lockscreen delegate"

The switch user greeter accesses it to get the "vtNumber" when you click the "Switch" button.

CHANGELOG: Fixed being unable to switch users from the Switch User screen

This reverts commit cc8647481095f5631ef8136945ee5d2d06981fd6.