Remove CONFIG_SCREEN_LAYOUT from InterestingConfigChanges params

This bit was causing a bunch of reinflations each time a foldable device was unfolded/folded.
From some manual testing, it seems everything still works as expected after the change.

Instead, CONFIG_LAYOUT_DIRECTION has been added, to cover the RTL change case.

This change saves ~295 ms when the device is unfolded.

Bug: 197515205
Test: Manually tested
Change-Id: I4a1943f56716100027c0aafb6746ba4e8aec02ae