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Fix vtkWin32OpenGLRenderWindow offscreen rendering problems

This fixes two problems hit while using offscreen rendering to save screenshots in Slicer (see https://github.com/Slicer/Slicer/pull/411).

Note this MR is for the OpenGL backend. Running the revised TestWin32OpenGLRenderWindow test with the OpenGL2 backend segfaults, at least on my machine.

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