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.

git-svn-id: https://develop.svn.wordpress.org/trunk@30563 602fd350-edb4-49c9-b593-d223f7449a82