`css-clean` (minifies our CSS) has an issue when using multiple backgrounds and background position together. Instead of relying on browser support for multiple backgrounds to display the WP logo as SVG, use the `.svg` CSS class.
see #30735.
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git-svn-id: http://core.svn.wordpress.org/trunk@30935 1a063a9b-81f0-0310-95a4-ce76da25c4cd