Revert "Use movement on the trackpad instead of on screen for trackpad...

Revert "Use movement on the trackpad instead of on screen for trackpad gestures used for gesture nav"

This reverts commit aef9d75f.

Reason for revert: The movement on the screen is proportional to the movement on the trackpad for gestures since finger ballistics only applies to cursor movement

Change-Id: Idd7f948545c35988183cfac0b74c730cf699d5f9