leaudio: Fix notifing Java layer about DISCONNECTED state

With this patch we make sure that if during connection,
user decide to disconnect device, the DISCONNECTED state will be sent
imidiatelly.

Bug: 265094193
Test: atest BluetoothInstrumentationTests
Test: atest bluetooth_le_audio_test bluetooth_vc_test
Test: atest bluetooth_csis_client test bluetooth_has_client_test

Tag: #feature
Change-Id: I0619e3396db8b542aac3c8c7bc28ccc0ea55518f