Creating a correctly populated mOccupied grid when reordering on foldables

On ag/21680045 I copy the previous mOccupied but the right thing to do is to
create a new one with all the views information.

Some test stoped running inadvertently that's why we didn't catch this issue.

There is a separate cl with the test to ensure we can catch it later on.

Fix: 289584301
Test: ReorderWidgets
Change-Id: I27b5a6e38a556d1c73ff8fbbdd552da6045e5b64