HF: Do not remove connect defer messages in Connected state

When we are in AudioOn state and  headset2 is connected,
we disconnect SCO and move to Connected state. If we remove the
connect defer message from the queue, we will not be able to
connect to the headset2.

CRs-Fixed: 971399
Change-Id: I45f34bf4c16a69276d7015167fc464003d3ea147