Change dropdown menu icon to not be replaced by close icon when open in web UI (#29532)

app/javascript/mastodon/components/dropdown_menu.jsx

@@ -9,7 +9,6 @@ import ImmutablePropTypes from 'react-immutable-proptypes';
 import { supportsPassiveEvents } from 'detect-passive-events';
 import Overlay from 'react-overlays/Overlay';
 
-import CloseIcon from '@/material-icons/400-24px/close.svg?react';
 import { CircularProgress } from 'mastodon/components/circular_progress';
 import { WithRouterPropTypes } from 'mastodon/utils/react_router';
 
@@ -298,7 +297,7 @@ class Dropdown extends PureComponent {
     }) : (
       <IconButton
         icon={!open ? icon : 'close'}
-        iconComponent={!open ? iconComponent : CloseIcon}
+        iconComponent={iconComponent}
         title={title}
         active={open}
         disabled={disabled}