erp5_ui_test_data: Missing http cache on png file

bt5/erp5_ui_test_data/SkinTemplateItem/portal_skins/erp5_ui_test_data/functional_test_data_folder/tiolive-ERP5.Freedom.TioLive.Logo-001-en.png.xml

@@ -6,6 +6,10 @@
     </pickle>
     <pickle>
       <dictionary>
+        <item>
+            <key> <string>_Cacheable__manager_id</string> </key>
+            <value> <string>must_revalidate_http_cache</string> </value>
+        </item>
         <item>
             <key> <string>__name__</string> </key>
             <value> <string>tiolive-ERP5.Freedom.TioLive.Logo-001-en.png</string> </value>