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
(cherry picked from commit 1c5514b5)
(cherry picked from https://googleplex-android-review.googlesource.com/q/commit:52d9d9780fb5a83302dd6fb3d875635a2ee57e1c)
Merged-In: I27b5a6e38a556d1c73ff8fbbdd552da6045e5b64
Change-Id: I27b5a6e38a556d1c73ff8fbbdd552da6045e5b64