Fix static tests.

Author: nmalevanec

app/design/adminhtml/Magento/backend/web/css/source/actions/_actions-select.less

@@ -7,6 +7,14 @@
 //  Actions -> Action select
 //  _____________________________________________
 
+//
+//  Variables
+//  _____________________________________________
+
+@_dropdown__padding-right: @action__height;
+@_triangle__height: @button-marker-triangle__height;
+@_triangle__width: @button-marker-triangle__width;
+
 //  Action select have the same visual styles and functionality as native <select>
 .action-select-wrap {
     @_action-select__border-color: @button__border-color;
@@ -18,9 +26,9 @@
 
     .action-select {
         .action-toggle-triangle(
-        @_dropdown__padding-right: @_action-select-toggle__size;
-        @_triangle__height: @button-marker-triangle__height;
-        @_triangle__width: @button-marker-triangle__width;
+        @_dropdown__padding-right;
+        @_triangle__height;
+        @_triangle__width;
         );
         .lib-text-overflow-ellipsis();