Fix work toggle button that gets blocked by threeButton nav bar on TABLETS

Ex) for tablets.. the nav bar height is really the height of the taskbar.
	Thats why we add the current padding of the work toggle button to the
	taskbar size.

As of patchset 3.. I reverted mDevice.getInsets().bottom because it caused
the button to be higher than it should be on landscape.
Bug: 235053326
Test: Manual (pictures in  bug thread)

Change-Id: I2f77d759ae060311d049182e8347dede590cd0b0