Reduce steps for goHome()

The goHome gesture is slow enough sometimes that it gets confused with an overview gesture. Reducing the step count should resolve this (verified in atest and haven't had it fail after changing this)

Flag: NONE
Bug: 336606166
Test: TaplTestsTrackpad#switchToOverview
Change-Id: I7ad388968205addb363cfd9ff4b7eefece170d1b