MAGETWO-54501: Incorrect position of the calendar button in the widget conditions

Author: undefined-olha

app/design/adminhtml/Magento/backend/web/css/styles-old.less

@@ -3795,7 +3795,7 @@
 
     .rule-tree {
         ._has-datepicker {
-            & + .ui-datepicker-trigger {
+            + .ui-datepicker-trigger {
                 position: static;
             }
         }