Settings: Fix disabling "location" service from widget is not working issue

It's an original issue. The "location" service has four mode,
When click "location" service from widget, will change the current
mode to next mode, rather than just turn off the location service.
So will cause "location" from widget can not be disabled.

Change the code that if current location mode is LOCATION_MODE_HIGH
_ACCURACY or LOCATION_MODE_BATTERY_SAVING, will change the mode to
LOCATION_MODE_OFF after click "location" from widget. This modify
is the same with settings location switch.

Change-Id: I1f6f67c657fe166490def72f11f16ea255f22dd3
CRs-Fixed: 789030