Fixes #5976, quick tweak to CSS in _dataTable.less & update UI test submodule.

plugins/CoreHome/stylesheets/dataTable/_dataTable.less

@@ -170,7 +170,7 @@ table.dataTable img {
   width: 450px;
 }
 
-.dataTable, .dataTable > .dataTableWrapper {
+div.dataTable, div.dataTable > .dataTableWrapper {
   margin-bottom: 9px; // same height as expand/contract button (so datatable height will encompass the
                       // expand/contract button)
 }