Keep setting of "TurnOff hotspot automatically" when AP is changed

When AP config is changed, setting of "TurnOff hotspot automatically"
will be reset to default. Hence keep the setting when AP config changed.
Keep setting of whether auto shut down is enabled when AP
config changed.

Co-authored-by: Fangxiao Cao <fangxiao.x.cao@sony.com>

Test: manual test
Bug: 235370570
Change-Id: Ibd3d59b6a86edaf1253a2c9b035576e60a7beb96