Slight generalization of task view hit test logic

The existing logic does not work if task views happen not to be
clipped. This makes the logic a little more generic.

Bug: 32101881
Test: Locally on Ryu device with existing Recents implementation as well as another, in-progress implementation.
Change-Id: I177aa5c2a020741175b2e9c85a48165fa7294b4e