leaudio: Improve disconnect from settings

Since GATT has own timeout on unused ACL, GATT client should not to try
to reconnect imidiatelly after getting BTA_GATTC_CLOSE_EVT with a reason
GATT_CONN_TERMINATE_LOCAL_HOST

Bug: 279566660
Test: atest bluetooth_le_audio_client_test
Test: atest BluetoothInstrumentationTests
Tag: #feature
Change-Id: Ic56a6ba645641b4bb6cfc5d9bb9dde0417356c5e