Fix toggle widget can be switched under overlapped view

- ag/11612781 added filterTouchesWhenObscured to toggle widget
  can't prevent the click behavior pass through the overlapped view.
- Due to click events was handled by SwitchPreference instead of the
  toggle widget.
- Enable the filterTouchesWhenObscured attribute on all
  SwitchPreferences in all pages of the special app access.


Bug: 155288585
Test: manual test
Here is the test steps
  1.Create an overlapped view's app and launch it to overlap the
    other apps.
  2.Launch Settings
  3.Goto Apps & notification > Advanced > Special app access
  4.Click any toggle under Special app access to monitor it can be
    switched or not. It must be not switched.
Change-Id: I9c9cf4719153292ed03f55a6eb9d3a308677aee3