Update home panel dream to always finish dream

Instead of calling wakeUp, which may be intercepted and ignored - call finish. This ensures the dream is finished whenever the embedded home controls activity is finished.

Flag: EXEMPT bugfix
Test: atest HomeControlsDreamService
Test: crashed home controls app and verified dream is finished when glanceable hub enabled
Fixes: 341957747
Change-Id: I4c2fefadfbc6bc35304bdcb44444d515571187a5