Leanback: Fix crash in navigation and removing a view

We should exclude removing view (but still focused) from focus search.
It crashes because we start searching from removing view's index in
RecyclerView which might be out of range of LM.getChildCount().

Bug 27766012

Change-Id: I6adc629dd3210abeb84072dc3f07d45b522d1b8a
2 files changed