HearingAid: Fix the data channel open fail case during connecting

* If the data channel open fail when the connection is come from
  background connection, will cause the profile doesn't correctly
  disconnect since the connecting_actively is false. Using
  accepting_audio instead of connecting_actively makes sure
  whether the data channel is opened.

Tag: #feature
Test: gd/cert/run
Bug: 220970000
Change-Id: I9c18331b0d462d5beeff82ddbb59c360a36e411b