Inconsistent placeholder icon in input and output views

## What Happened

On a desktop without any audio devices attached, you can see the placeholders for both input and output views. It appears that on the output view we're using the `-muted` status icon, but on the input view, we're using the regular device icon.

## Expected Behavior

We should probably be consistent here and use either both status icons or both device icons. I also wonder if we should be using a `-missing` status like the battery icon since the device isn't actually muted, as seen by the sound indicator which is happy to display the volume level for a non-existent device