Prompt to set a screen lock when adding a restricted profile

Bug: 8735493

If there's no screen lock, prompt to take the user to set a lock.
On return, check if user set the screen lock. If so, add the restricted
profile, otherwise don't add it.

Fix a small layout issue: Bug: 8721209

Change-Id: I2a18fea50a1d810d6a7fa82038b460ca4e03d5a0