BASS: Fix unable to disconnect from settings

Intentional disconnect does not mean changing the connection policy.
We need an additional flag to distinct the intentional disconnection
through the API call from the unintentional one.

Bug: 234312519
Fixes: 234312519
Tag: #feature
Test: atest BassClientStateMachineTest --no-bazel-mode
Change-Id: I989652de2081082af89388aea91be05a8967e39c