Fix issue with configuration update check.

- We can hold a reference to the same configuration since it is updated
  and re-dispatched. Instead, make a copy of the configuration to store
  the last configuration state.

Fixes: 63755686
Test: Open Recents, rotate, ensure that the display bounds and task bounds
      are calculated correctly.

Change-Id: Ie0d2b5a0fa479428614d9593a2379420ccbd2fb4