fix(useScroll): handle reverse flex direction

[joris-gallot]

Description

fixes #2737

When defining the flex-direction style of the html element as column-reverse or row-reverse, the arrivedState property must change the way its properties are calculated

Additional context

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What is the purpose of this pull request?

• Bug fix
• New Feature
• Documentation update
• Other

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• Read the Contributing Guidelines.
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[antfu]

Close in favor of #2577, thanks!