Update VirtualizedList.js, fix wrong position after scrollToEnd when props.refreshing === true

[zongwan]

Pull request again for clean branch

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What existing problem does the pull request solve?
Fix #14033
Fix wrong position after scrollToEnd when props.refreshing === true

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[zongwan]

#12889
same problem

https://github.com/Guardiannw/react-native/blob/ad79eedabeb9fe38d8d26dcb15711236ec14258a/React/Views/RCTScrollView.m#L523

https://github.com/zongwan/react-native/blob/de5149bac464b158ff88a066d092178bca59ae87/Libraries/Lists/VirtualizedList.js#L195

[sahrens]

Sweet, thanks! I'm importing the scrollview fix too.

[facebook-github-bot]

@sahrens has imported this pull request. If you are a Facebook employee, you can view this diff on Phabricator.