Test Plan:
Open Krunner and type ?
Scroll though the list of results until one has a configure button
Click that button and check if systemsettings opens and the runner's KCM is opened
This way the powerdevil and session runners do not display
their first syntax in the overview, but rather the description of what
the runner does in general.
This is needed, because those syntaxes are very specific to a certain
bit of the functionality that the runner provided.
This is implemented using the new X-KDE-ConfigModule property.
Older or KCMs that use the deprecated query mechanism will not show up,
but considering that this is a new feature it does not seem worth adding
support for it.
Alexander Lohnau