Missing icon for xfce4-pulseaudio-plugin in systray

I found surprisingly few references to people having the same issue, so this probably doesn't affect everyone.

OS: Fedora Silverblue (Universal Blue - Vauxite)
Chicago95 installed using the installer in a virtualenv

The `audio-volume-*.png` icons are missing from `~/.icons/Chicago95/status/symbolic/` directory, causing the "missing-asset"/default icon to be shown in the systray for the pulse audio volume control applet instead of the speaker icon.


A fix for this is to copy the `audio-volume-*.png` icons from `~/.icons/Chicago95/status/16/` to the `symbolic` directory and reload `xfce4-panel`:

```
[user@localhost ~]$ cp ~/.icons/Chicago95/status/16/audio-volume-*.png ~/.icons/Chicago95/status/symbolic/
[user@localhost ~]$ xfce4-panel -r
```

After this the volume applet icon is displayed properly. The other icons in the symbolic folder seem to be 16x16 too, so I assume that's the correct size.