Close unexpected HearingAid open event if is not attempting to connect

When HearingAid bta layer receive unexpected HearingAid open event,
should close it if is not attempting to connect.

Bug: 131863877
Test: 1.Forget/Repair HearingAid device from Bluetooth UI.
2.Disconnect/Reconnect HearingAid device from Bluetooth UI.
3.HearingAid device power off/on, check them can reconnect.

Change-Id: I75d63d0441dcc6b7338b1e30453021eb271f4872