Don't rely on nav mode change listener for oriented state

When nav mode state changes, launcher gets
re-instantiated, which means the listener for
nav mode changes often gets destroyed before it
even gets fired. Rely on the initial setup to
set the correct nav mode.

The other bug with relying
on the initial value was that we were initially
getting the old nav mode when initFlags was called
from the ctor, but then the correct updated nav
mode when called from initListeners(). The first
call would enable rotation but then the second
call wasn't disabling it. Now we toggled based on
nav mode each time.

Another bug fix in RecentsView was not calling
update when launcher rotation is enabled. That was
added when previously we were using HOME_ROTATED
and PORTRAIT as different PagedViewHandlers to
differentiate when launcher rotation was enabled.
HOME_ROTATED is now removed, so we no longer need
to change the internal state of RecentsOrientedState.

Fixes: 159176222
Change-Id: I2a37880ce3cf835ca5b9b165ce3840537facee6c