Don't clip recents items with system bars

In order for items to go under the system bars, we have the recents view
consume the insets by setting padding to the recyclerview instead of
setting the margins with it. Then, we ensure the recycler view does not
clip to padding so that items are still visible even when scrolled past.

Bug: 131626311
Test: Manual test; items go under system bars
Change-Id: Iecbab537b8f9e2993ad5f74f87ba2e0c56fb0f63