Change icon SVG imports to use a default import (#28709)

app/javascript/mastodon/components/edited_timestamp/index.jsx

@@ -5,7 +5,7 @@ import { FormattedMessage, injectIntl } from 'react-intl';
 
 import { connect } from 'react-redux';
 
-import { ReactComponent as ArrowDropDownIcon } from '@material-symbols/svg-600/outlined/arrow_drop_down.svg';
+import ArrowDropDownIcon from '@material-symbols/svg-600/outlined/arrow_drop_down.svg?react';
 
 import { openModal } from 'mastodon/actions/modal';
 import { Icon }  from 'mastodon/components/icon';