web_renderjs_ui: use context-free getDocumentValueList for reference lookups

When looking up a document by reference, using getDocumentValueList from
the context of a web site / web section might not find the documents,
depending on the predicates defined on the web site / web section.

bt5/erp5_web_renderjs_ui/SkinTemplateItem/portal_skins/erp5_web_renderjs/WebSite_checkCacheModificationDateConsistency.py

@@ -11,7 +11,7 @@ if appcache_reference:
   appcache_manifest_modification_date = appcache_manifest.getObject().getModificationDate()
 
   if url_list:
-    for referenced_document in context.getDocumentValueList(reference=url_list):
+    for referenced_document in context.getPortalObject().portal_catalog.getDocumentValueList(reference=url_list):
       if referenced_document.getModificationDate() > appcache_manifest_modification_date:
         error_list.append(
           "Document {} is newer than cache manifest".format(referenced_document.getReference()))

bt5/erp5_web_renderjs_ui/SkinTemplateItem/portal_skins/erp5_web_renderjs/WebSite_getTranslationDataTextContent.py

@@ -18,7 +18,7 @@ web_page_by_reference = {}
 if web_page_reference_list:
   web_page_list = [
     b.getObject() for b in
-    context.getDocumentValueList(reference=web_page_reference_list)]
+    portal.portal_catalog.getDocumentValueList(reference=web_page_reference_list)]
   web_page_by_reference = {wp.getReference(): wp.getTextContent() for wp in web_page_list}
 
 for web_page_reference in web_page_reference_list: