Update screenshot tests

crates/egui_demo_lib/tests/snapshots/rendering_test/dpi_1.00.png

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crates/egui_demo_lib/tests/snapshots/rendering_test/dpi_1.25.png

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crates/egui_demo_lib/tests/snapshots/rendering_test/dpi_1.50.png

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crates/egui_demo_lib/tests/snapshots/rendering_test/dpi_1.75.png

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crates/egui_demo_lib/tests/snapshots/rendering_test/dpi_2.00.png

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