Make visible change for new post notification setting icon (#22541)

app/javascript/mastodon/features/account/components/header.js

@@ -193,7 +193,7 @@ class Header extends ImmutablePureComponent {
     }
 
     if (account.getIn(['relationship', 'requested']) || account.getIn(['relationship', 'following'])) {
-      bellBtn = <IconButton icon='bell-o' size={24} active={account.getIn(['relationship', 'notifying'])} title={intl.formatMessage(account.getIn(['relationship', 'notifying']) ? messages.disableNotifications : messages.enableNotifications, { name: account.get('username') })} onClick={this.props.onNotifyToggle} />;
+      bellBtn = <IconButton icon={account.getIn(['relationship', 'notifying']) ? 'bell' : 'bell-o'} size={24} active={account.getIn(['relationship', 'notifying'])} title={intl.formatMessage(account.getIn(['relationship', 'notifying']) ? messages.disableNotifications : messages.enableNotifications, { name: account.get('username') })} onClick={this.props.onNotifyToggle} />;
     }
 
     if (me !== account.get('id')) {