Prevent an infinite waiting of ACL connection to drain

There is a case that BTM_GetNumAclLinks > 0, but
force_disconnect_all_acl_connections() == false. In that case,
bta_dm_wait_for_acl_to_drain_cback() is not called twice, and it
enters infinite waiting. This CL prevents the infinite waiting.

Bug: 208477587
Tag: #refactor
Test: atest CtsBluetoothTestCases bluetooth_test_gd_unit
Change-Id: Ife1891f99a085a9ddefeed63b9b807827f963ccb