Adapter: Do not rethrow when the app is dead

The API guidelines mentions that rethrowing apply for systemProcess
only. The Bluetooth app is not a system process and can go down anytime.

Bug: 342651726
Fix: 342651726
Test: None | atest CtsBluetoothTestCases
Flag: Exempt behavior during dead process is edge case
Change-Id: Ia050c932dd9ee2f522c5bd60686f8df080904f38