fix for #531  urn:ogc:def:storedQuery:OGC-WFS::GetFeatureById  to  urn:o...

Following URN Code is used for StoredQuery identifiers:

urn:ogc:def:storedQuery:OGC-WFS::GetFeatureById

Following one is expected by compliance tests and a confirmed CR:

urn:ogc:def:query:OGC-WFS::GetFeatureById