Bundled Themes: Update Twenty Twenty.
This brings Twenty Twenty in sync with GitHub. For a full list of changes since 5.3 RC4, see c267289...ab5fa23
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Reviewed by SergeyBiryukov.
Props williampatton, poena, andersnoren, desrosj, schlessera, leprincenoir, alextran, aristath, b-07, allancole, karmatosed, pierlo, joen, ianbelanger.
See #48110, #48386, #48450, #48505.
Merges [46701], [46702], [46711] to the 5.3 branch.
Fixes #48557.
Built from https://develop.svn.wordpress.org/branches/5.3@46712
git-svn-id: http://core.svn.wordpress.org/branches/5.3@46512 1a063a9b-81f0-0310-95a4-ce76da25c4cd