Fix a regression from miss detect cross-task target.

Regression from I9aff6399020df9012ba807a1b834c74ee07a7c50 in Task_SWTICH
The type of window container can also be ActivityRecord.
Also by passing transition targets instead of participants to
BNC#onTransactionReady, BNC can by-pass empty transition.

Bug: 274997067
Test: manual verify back-to-home/task/activity(includes TaskFragment)
animation work properly.

Change-Id: I5d88672e7700b543ae90619c3ed8012c849fdd86