Properly update profile connection state.

When DUT is toggled between various paired Headsets Connection
state is not updated properly in some scenarios.This is causing
Bluetooth icon to be in connected state even when no Headsets are
connected.Also make sure connected,connecting,disconnecting devices
count is never negative.

Change-Id: Icb1a7215ff6d9491afbb5f7f203ca0a2c6b7f43a
CRs-Fixed: 532783