Prevent secondary home handle from handling touches

This change doesn't affect the hit test for
determining if a touch is for an app vs the
nav bar region, it just allows touches to go
through the secondary home handle if someone wants
to interact with underlying app mid quickswitch.

Fixes: 162755095
Change-Id: I915f25a0c7d4c68179c6c8862edbe2b486d671dc