Show "Backup service isn't active" if backup isnt active for work

profile

Bug: 127821779

Test: 1) Set up work profile.
2) adb shell bmgr --user 19 activate true
3) Settings -> System -> Backup -> Work -> Shows google backup settings
4) adb shell bmgr --user 19 activate false
5) Settings -> System -> Backup -> Work -> "Backup service isn't active"

Change-Id: Ifc16cf3e69fd9db87d519cbad68f0f8e9d8ef6f3