Update `embedded.png` after running `grunt imagemin`.

After [30059] and [30079] we still had four images which could be minified. Three of them are handled by [30562], the last one by this.

fixes #30141.
Built from https://develop.svn.wordpress.org/trunk@30563


git-svn-id: http://core.svn.wordpress.org/trunk@30552 1a063a9b-81f0-0310-95a4-ce76da25c4cd