Bass: Modify source on duplicate addition

That's allow to sync and resume receivers source synchronization
by modify source instead of remove and add source one again.

Another problem was that if there was room for source addition,
then duplicate addition ends with no action on sink and error callback.

Bug: 375125837
Bug: 363168099
Test: atest BassClientServiceTest BassClientStateMachineTest
Change-Id: Id18778c4791eee510b547104413aee9bff30841d