Bundled Themes: Update Twenty Twenty.
This brings trunk
’s version of Twenty Twenty in-sync with GitHub.
For a complete list of changes since [46551], see https://github.com/WordPress/twentytwenty/compare/bc89c51...4549fd9.
Reviewed by SergeyBiryukov, desrosj, ianbelanger.
Props anlino, ianbelanger, poena, williampatton, nielslange, acosmin, intimez, itowhid06, decrecementofeliz, aristath, westonruter, mukesh27, jorgefilipecosta, karmatosed.
Fixes #48386.