leaudio: Fix for ase state on CIS disconnect

ASE state shall not be changed on CIS disconnection, if ASE is not in
streaming.

Without this fix there was an issue when remote device disconnected CIS
when Android sends Release command.

Bug: 261425707
Test: atest BluetoothInstrumentationTests
Test: Manual test with device disconnecting CIS on Release
Tag: #feature
Change-Id: I1e1e1160c4c3e9cb1d9e95c8520bb6c472d7bdec