Small KApplication cleanups

[Urs Wolfer]

Hi all

While looking into kapplication.cpp, I have seen some things that are not 
really nice or not required anymore. Please see the attached patch.

Key points:
* cleaner icon loading code
* remove not anymore needed KDE 3 workarounds (I was not able to reproduce the 
described issues anymore)

If there are no objections, I will commit these small changes tomorrow.

Bye
urs
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