Don't use View ID to search next focus backward View

There might be several Views with the same ID in View hierarchy,
and if we search the user specified next focused view by comparing
the View ID, it may return the wrong View with the same ID. To fix
that, we should compare the View itself.

Fixes: 147829061
Test: manual

Change-Id: I3eeb68ed3ea30ce9461165eea56227cb81b21929