officejs_upgrader: change caching-policy-check to use "must-revalidate"

bt5/officejs_upgrader/SkinTemplateItem/portal_skins/officejs_upgrader/WebSection_checkAppstoreApplicationCachingPolicyConsistency.py

@@ -4,10 +4,10 @@ error_list = []
 person = web_section.getSourceValue(portal_type='Person')
 if (web_section.getParentId() == 'application-list') \
    and (web_section.getAggregate() == 'web_page_module/gadget_ojs_appstore_redirect_page_html') \
-   and (web_section.getCachingPolicy() == 'must-revalidate'):
-  error_list.append('"Must-revalidate" caching policy is deprecated')
+   and (web_section.getCachingPolicy() == 'one-hour-max-modification-date'):
+  error_list.append('"One-hour-max-modification-date" caching policy is deprecated')
 
   if fixit:
-    web_section.edit(caching_policy='one-hour-max-modification-date')
+    web_section.edit(caching_policy='must-revalidate')
 
 return error_list