AckPause when disarmed

There are some cases where `le_impl` doest not
call `AckPause`, preventing it from entering the
PAUSED state and `le_address_manager` from
handling subsequent commands.

This change ensures that `le_impl` calls AckPause when
it's disarmed.

Bug: 348637133
Bug: 357024179
Test: atest LeImplTest

Change-Id: I945b97b1aedc1b32e17895b3a222a08cb8be0c67