Force render with just that camera on CreateScreenshot

[carolhmj]

If a camera is specified as an argument, fall back on the CreateScreenshotUsingRenderTarget function.
Related forum issue: https://forum.babylonjs.com/t/screenshot-tool-does-not-seem-to-respect-camera-argument/31167
Related Playground: https://playground.babylonjs.com/#M6HFGB

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[azure-pipelines]

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Snapshot stored with reference name:
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[RaananW]

Just need to run formatting :-)

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Snapshot stored with reference name:
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