Ensure some taskbar states are initialized correctly

- Update FLAG_IN_APP to account for setup state to ensure that the
  stashed state is correct. This needs to be done in the stash
  controller since SUW is the home activity on startup and the
  launcher state controller will not be initialized until after
  SUW finishes
- Initialize the launcher state and resumed flags in case Launcher
  restarts while another app is resumed

Bug: 204384193
Test: Run through SUW, ensure the background is not visible
Change-Id: I5ce061ad16e79226c8428339ccd0b5ac55c07205