Wrap ZakLa01 response XSLT should not contain any ZGW to ZDS translations

[MLenterman]

The XSLT for building the response message should only contain transformations related to the response message structure. ZGW to ZDS translation should be done own mapping XSLT's. An example can be found with geefLijstZaakDocumenten. The mapping to heeftRelevante contains untranslated ZGW values. These are currently translated when building the ZakLa01 response message.