ETT-799: update modal component with keyboard focus for download panel #139
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This PR is a companion to the page turner a11y bugs PR. This implements the event listener for closing the download modal.
There isn't really anything here to review unless you want to test this out in pt on dev-3: https://dev-3.babel.hathitrust.org/cgi/pt?id=mcg.ark:/13960/t6tx4zx69&seq=3
Open the download panel, click the Download button. Once the modal pops up, use your keyboard and press
ESC. The modal should close and the focus return to the Download button in the sidebar.