Use same show picto in list view (#4427)

Resources/views/CRUD/list__action_show.html.twig

@@ -11,7 +11,7 @@ file that was distributed with this source code.
 
 {% if admin.hasAccess('show', object) and admin.hasRoute('show') %}
     <a href="{{ admin.generateObjectUrl('show', object) }}" class="btn btn-sm btn-default view_link" title="{{ 'action_show'|trans({}, 'SonataAdminBundle') }}">
-        <i class="fa fa-search-plus" aria-hidden="true"></i>
+        <i class="fa fa-eye" aria-hidden="true"></i>
         {{ 'action_show'|trans({}, 'SonataAdminBundle') }}
     </a>
 {% endif %}