Avoid cancelling pairing when disconnected on other transport

Pairing gets cancelled when the other transport gets disconnected.

Test: mmm  packages/modules/Bluetooth
Flag: com.android.bluetooth.flags.cancel_pairing_only_on_disconnected_transport
Bug: 338465075
Bug: 338152239
Change-Id: I78be5d9144e305f35b96ef9106f993e4d0639fb2