Bug#791729: Executing via systemsettings is not the only way to do it

[Scott Kitterman <debian@kitterman.com>]

kde-gtk-config doesn't require systemsettings at all.  As  a work-around 
unstill both systemsettings and kde-gtk-config you can execute the following:

kcmshell5 kde-gtk-config

This is only a transient issue as we migrate from KDE4 SC to Plasma 5.  
Adjusting severity accordingly.

Scott K