Revert "CapturedTouchpadEventConverter: report relative axes"

This reverts commit 727b15d9cdbbe58f3ccca1f8dbef23e0dd41a5fa.

Reason for revert: test flakes blocking other flag ramps (b/365166534)

Test: Treehugger
Bug: 365166534
Bug: 330522990
Change-Id: I80be57481134a86064f7acc573fe9292c17de237