SQLCatalog_deferFullTextIndex: De-hardcode called method.

Both the dummy method_id and the actually-used grouping_method_id.

bt5/erp5_full_text_mroonga_catalog/CatalogMethodTemplateItem/portal_catalog/erp5_mysql_innodb/SQLCatalog_deferFullTextIndex.py

 # This script is called to defer fulltext indexing in a lower priority.
-GROUP_METHOD_ID = context.getPath() + '/SQLCatalog_deferFullTextIndexActivity'
+METHOD_ID = script.id + 'Activity'
+GROUP_METHOD_ID = context.getPath() + '/' + METHOD_ID
 activateObject = context.getPortalObject().portal_activities.activateObject
 for document, root_document_path in zip(getPath, getRootDocumentPath):
+  getattr(
     activateObject(
       document,
       activity='SQLQueue',
@@ -9,4 +11,6 @@ for document, root_document_path in zip(getPath, getRootDocumentPath):
       node='same',
       group_method_id=GROUP_METHOD_ID,
       serialization_tag='full_text_' + root_document_path,
-  ).SQLCatalog_deferFullTextIndexActivity()
+    ),
+    METHOD_ID,
+  )()