Add check to verify if separate lock is setup for private space.

With this change on selecting new lock option for private space it is
taken care to handle back/swipe left action to show the lock setup
screen again if a separate lock is not setup for private profile.

Bug: 307281644
Bug: 313142822
Test: Manual
Change-Id: I8f31b7f69307c0c6947cb0f6c52cb3560e69a156