Fix CUSTOM_ID completion for PROPERTY drawers

The wrong name was added for CUSTOM_ID in the completion list for
properties in commit 931e13d (Custom IDs: Documentation and
improvements)

lisp/org.el

@@ -11148,7 +11148,7 @@ These are properties that are not defined in the property drawer,
 but in some other way.")
 
 (defconst org-default-properties
-  '("ARCHIVE" "CATEGORY" "SUMMARY" "DESCRIPTION" "CUSTOM_LINK"
+  '("ARCHIVE" "CATEGORY" "SUMMARY" "DESCRIPTION" "CUSTOM_ID"
     "LOCATION" "LOGGING" "COLUMNS" "VISIBILITY"
     "TABLE_EXPORT_FORMAT" "TABLE_EXPORT_FILE"
     "EXPORT_FILE_NAME" "EXPORT_TITLE" "EXPORT_AUTHOR" "EXPORT_DATE"