Fix issue #17740687: Device does not boot after flashing LMP dev TOT(1478825) build.

There was a path through idle where we could clear mBooting but not set
mBooted, so we would no longer start activities.  This is probably happening
because if you start a user or userdebug build with the device plugged in
to adb, the system early on starts the USB security dialog, before home is
started.  If that goes idle first, we will end up in the case where we
clear booting (because something went idle) but not set booted (because it
was not home that went idle).

Change this so that we always set booted when clearing booting.

Change-Id: I40053710eefa939315aeb9475ecdd2e8a87351ff