Update base_list.html.twig

Added missing class sonata-ba-list to trigger CSS rule that display select button on sonata_type_model_list

Resources/views/CRUD/base_list.html.twig

@@ -35,7 +35,7 @@ file that was distributed with this source code.
                     <form action="{{ admin.generateUrl('batch', {'filter': admin.filterParameters}) }}" method="POST" >
                         <input type="hidden" name="_sonata_csrf_token" value="{{ csrf_token }}">
                     {% endif %}
-                        <table class="table table-bordered table-striped">
+                        <table class="table table-bordered table-striped sonata-ba-list">
                             {% block table_header %}
                                 <thead>
                                     <tr class="sonata-ba-list-field-header">