Added setprop to go back after gesture end

Added a new setprop to perform back when home swipe gesture ends, after
touch up event. This will disable the ability to have multiple back
events over a period of time. Also shortened the pulling home button
distance.

Usage: setprop persist.quickstepcontroller.homegoesbackwhenend true

Bug: 112934365
Test: go/home-back-gesture
Change-Id: I49b91ef09e0b35f971e76173cbf163daead66746