Fix migration for home role.

Fixes: 141703336
Fixes: 141840533
Test: Upgrade from P->Q with this fix and a custom launcher as
      default, and it was preserved.
Test: Factory reset Q with this fix and the device default launcher is
      used.
Change-Id: I2d31f7128881f6d8173fda7cf3b64517c2a28153
2 files changed