Update screenshots (#546)

Signed-off-by: jiaweig <[email protected]>

Signed-off-by: jiaweig <[email protected]>

Scripts/ExpectedScreenshots/CullingAndLod/screenshot_1.png

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Scripts/ExpectedScreenshots/Shadow/point_lights.png

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Scripts/ExpectedScreenshots/Shadow/spot_initial.png

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Scripts/ExpectedScreenshots/Shadow/spot_shadowmap_size.png

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Scripts/ExpectedScreenshots/StandardPBR/015_subsurfacescattering_transmission_thin.png

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