BassClient: Pass current receiver state on first set code check

There is a null pointer dereference while parsing first receiver state
that requires broadcast code. Patch passes current receiver state if
there is first set code check performed.

Test: presubmit
Test: atest BluetoothInstrumentationTests
Test: atest BassClientStateMachineTest
Bug: 150670922
Bug: 229965085
Tag: #feature
Sponsor: jpawlowski@
Change-Id: I413cc4d138b3ab06aff95c15ebf3cef717fda2d7