MC-3479: Remove Accordion

- remove accordion styles from _import

Author: krissyhiserote

app/code/Magento/PageBuilder/view/adminhtml/web/css/source/content-type/_import.less

@@ -8,7 +8,6 @@
 //  _____________________________________________
 
 @import '_preview.less';
-@import 'accordion/_import.less';
 @import 'banner/_import.less';
 @import 'block/_import.less';
 @import 'button-item/_import.less';