Remove double svg wrapping from the mirador icon

src/components/icons/MiradorIcon.js

@@ -7,11 +7,9 @@ import SvgIcon from '@material-ui/core/SvgIcon';
 export default function MiradorIcon(props) {
   return (
     <SvgIcon viewBox="0 0 60 55" {...props}>
-      <svg xmlns="http://www.w3.org/2000/svg" width="60" height="55" viewBox="0 0 60 55">
       <rect width="18" height="55" />
       <rect width="18" height="55" transform="translate(42)" />
       <rect width="18" height="34" transform="translate(21)" />
-      </svg>
     </SvgIcon>
   );
 }