Bug#314170: workaround - Volume slider covers system tray icon persistently

[Nieko Woets <nwoets@gmail.com>]

Since this bug will never be fixed I offer a workaround for future
reference for those who have the same problem.

Open KDE > Control Center > Desktop > Window-Specific Settings and use
the "New..." button to add the slider, which is a window after all, to
the exception list. There is a "Detect" button to identify the slider
window, so keep the slider window popped up. Modify the Geometry >
Position attribute to a fixed position on the screen.