Make FakeAudioRepository default isAffectedByMute to be closer to the real repository

On the device all streams but CALL and ALARM can be muted (at least from
ones that are displayed in the Volume Panel).

Flag: EXEMPT tests only
Test: atest VolumePanelScreenshotTest
Fixes: 362736010
Change-Id: I483aff93c1b9fb20dac7a00db81b6ae4c020fb20