Plasma 6 preview wallpaper

Jonathan Esk-Riddell requested to merge plasma-6-preview-wallpaper into master

Add a "Plasma 6 Preview" banner to the wallpaper This is so that we have an easy way to recognise that we are running a preview of Plasma 6. This will be useful when people are posting screenshots and a reminder than it's early stage development software.

Edited by Jonathan Esk-Riddell

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