Get rid of the `Can't find variable: auto` error, by removing the extra `{ }` and usages of `document.currentScript`.
<rdar://problem/106481674>
Pull request: https://github.com/WebKit/WebKit/pull/11280
Submitted web-platform-tests pull request: https://github.com/web-platform-tests/wpt/pull/38900
Committed 261403@main (12e1e3071116): <https://commits.webkit.org/261403@main> Reviewed commits have been landed. Closing PR #11280 and removing active labels.