determine default theme for plasma

[Shaun Reich]

> Plasma::Theme::default()->setThemeName("default")

s/default/Air/

I just tried now with the desktop scripting console, and: 'theme =
"Air"' is apparently equivalent to "Oxygen", and it's this big black
theme on my system. So the default in kdm is apparently this...and I'm
unsure why Air isn't being..well, air.

-- 
Shaun Reich,
KDE Software Developer (kde.org)