fix(search): close when clicking backdrop cross-browser #436
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the
closedby
attribute on<dialog>
allows us to close these (including the search) by clicking on the backdrop, but this doesn't work in Firefox Release (only Firefox Nightly). https://github.com/tak-dcxi/dialog-closedby-polyfill fixes this, but it's a bit heavy - and really covers all edge cases, which we don't use - so I cut it down a lot, and included only what we needTested in Firefox Release/Nightly and Chrome: would be great to get a test in Safari too