ENGCOM-1955: [Backport] fix for dropdown toggle icon in cart #16043

 - Merge Pull Request #16043 from chirag-wagento/magento2:2.1-develop-PR-port-15991
 - Merged commits:
   1. 7c3ce72

Author: magento-engcom-team

app/design/frontend/Magento/blank/web/css/source/_extends.less

@@ -1401,7 +1401,7 @@
         &.active {
             > .title {
                 .lib-icon-font-symbol(
-                @_icon-font-content: @icon-prev,
+                @_icon-font-content: @icon-up,
                 @_icon-font-position: after
                 );
             }