Merge "Revert "Only update default home when the preferred home activity is...

Merge "Revert "Only update default home when the preferred home activity is modified."" into sc-dev am: 7e7c76c8 am: 6bebe24d am: 71806ba8

Original change: https://googleplex-android-review.googlesource.com/c/platform/frameworks/base/+/14477457

Change-Id: Ic388c5e4b4cc8d77e579934436ad6e834485dc36