Disable seconds on the unseen clock depending on style

Bug: 34856983
Test: Manually test adjusting all combinations of clock style and seconds

This has two benefits:
1) the unseen clock no longer schedules one second callbacks to update a
GONE component
2) It avoids the reported exception caused by Activity.recreate()

Change-Id: I0a1a3e30a5e4ae6c751a2285ca25f4470fc2bb9d