[osg-submissions] Minor modification to osgshadow.cpp

[Wojciech Lewandowski]

Robert,

W.r.t. our recent shadow disucssions,  I am sending in slightly modified osgshadow.cpp example.  

I removed few lines of code that were setting Threading mode and Screen mode. I believe they are now not neccessary because the same does osgViewer::Viewer argument parser. In fact argument list does not contain these args after they were parsed by osgViewer::Viewer constructor.   

I also allowed myself to add ThreadingHandler to the example. I hope it will speed up testing and solving the issue J-S noticed. 

Cheers,
Wojtek
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