Refactor Utilities#isTablet to Utilities#isLargeScreen

The utility checks the dimension of the screen rather than the device
itself. This means that on a foldable it would return true when unfolded
even though it is not a tablet.

Test: Checked code usages to see if expectations were correct.
Fixes: 267285637
Change-Id: I9ab45d65e08a6024729819724e8661e00419ebdd