[osg-submissions] osgviewerSDL Resize

[Jeremy L. Moles]

This extra call to SDL_VideoSetMode() prevents my viewport from getting
all wonky when I resize the SDL window. I'm not sure if this bug has
always existed or not, but according to the SDL documentation this
operation should be safe regardless, and doesn't not introduce the need
for extra memory management (that is: there is no need to "cleanup" the
old screen variable, that is all handled by SDL for us).
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