Don't crash during setup of secondary users

Make sure to call super.onActivityCreated() even in the short-circuit
case where there's an early 'return'.  This has probably been broken
for a long time but was never exercised while bringing up a new-from-
scratch device, but is the usual code path now for secondary users.

Change-Id: I0c1a5116440908d65750133689507917307e1dcd