MAGETWO-36466: Make PR fro Sprint 17

- Fixed obsolete less mixin

Author: Bogdan Plieshka

app/design/adminhtml/Magento/backend/Magento_Backend/web/css/source/module/pages/_dashboard.less

@@ -17,7 +17,6 @@
 //  ---------------------------------------------
 
 .dashboard-data {
-    .table-info();
     background: @dashboard-tabs__background-color;
     font-size: @dashboard__font-size__base;
     width: 100%;