Remove trailing whitespace

Resources/views/standard_layout.html.twig

@@ -255,7 +255,7 @@ file that was distributed with this source code.
                                                         {% endfor %}
                                                     </div>
                                                 {% endif %}
-                                                
+
                                                 {% block sonata_admin_content_actions_wrappers %}
                                                     {% if _actions|replace({ '<li>': '', '</li>': '' })|trim is not empty %}
                                                         <ul class="nav navbar-nav navbar-right">