Preference list was getting duplicated on pausing and resuming the activity.
Pull the user info out of the preference list and make it a static header
so that it stays fixed. Can now remove all entries before re-adding.
Disable location by default and disable ability to change Unknown sources
toggle.
Bug: 8685561
Bug: 8688400
Change-Id: I64ce728d5369e03ddaba562bcd66bb0720a037d2
Bug: 8631653
Make "Unknown sources" visible but disabled if restricted for limited user.
Bug: 8629605
Also show the restriction name as the dialog title in the picker.
Change-Id: I8d6ea3571bcc4372347cad6a2c982f35afa7cc09
