Swap L51 and L50

[SeverS]

Fixes #157 by swapping the lines L51 with L50.

Minimal repro repository:
https://github.com/SeverS/single-spa-react-repro
gh-pages : https://severs.github.io/single-spa-react-repro/

As you can see on gh-pages, the Button parcel works as expected when it's mounted inline but when you click it the modal which is using appendTo throws an error (check console)

[changeset-bot]

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Latest commit: 6241131

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