Remove usage of raw event coordinates for touch slop calculation

- This change was added in ag/3737691 for 2 button mode which is now
  removed from the system, using the raw coordinates is problematic
  since they depend on device orientation

Bug: 231636998
Test: Enable 3 button, rotate to landscape and verify unpinning works
Change-Id: I3f942a00570d516a7642182ff1412b17cd5464ff