FIX: plastik style poor color choices for tree views

[Matthew Woehlke]

In certain color schemes (particularly dark window background color), 
the Plastik style makes poor color choices that can make the lines in 
tree views, and the boxes around the expand icons, nearly invisible.

The attached patch fixes this. Ok to commit? Or would someone like to 
suggest an alternative fix? (Also I'm fine with second opinions on the 
alphaBlend factors; I more-or-less pulled these out of the air.)

(At least Phase also has this problem, see 
http://bugs.kde.org/show_bug.cgi?id=137055)

-- 
Matthew
OFFICER throws a tear gas grenade at you. You start to feel nauseous. 
You need fresh air quickly.
 > OPEN WINDOWS
Sorry, I have a philosophical objection to Microsoft products.
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