[plasma-workspace] /: Move path argument into KIconLoader ctor

[Martin Klapetek]

Probably breaks the systray icons for qt4 apps (it wouldn't work in this
way); however dfaure reverted the commit in a wrong branch and is reverting
it and retaging and stuff, so can you please keep an eye on KIconThemes and
revert this commit once it's reverted in there? Thank you.

Cheers
-- 
Martin Klapetek | KDE Developer
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