Screenshots on Android sometimes flipped

[bitsandfoxes]

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On some Android devices, (like the OnePlus DN2103) screenshots appear flipped. https://github.com/getsentry/sentry-unity/blob/ac17f8329bf5cafa30f5c8d78a344ce2e7bf0a39/src/Sentry.Unity/ScreenshotAttachment.cs#L70 needs a different check.

UNITY_UV_STARTS_AT_TOP might work.