add missing shadows to the access control policies page (#31364)

webapp/channels/src/components/admin_console/schema_admin_settings.scss

@@ -2,6 +2,7 @@
     border-radius: 4px;
     margin-top: 20px;
     background: white;
+    box-shadow: 0 2px 3px rgba(0, 0, 0, 0.08);
 
     .admin-console__wrapper {
         padding: 0;