Canonical sort no longer reflects actual fields from the record ontology

[jgonggrijp]

The FlatFields collection type in frontend/vre/field/field.model.js still (since long ago) employs the canonicalSort function from frontend/vre/utils/generic-functions.js to determine the order of the fields. The code still works, but the array that defines the preferred order contains keys that no longer reflect the actual field names.

Maybe not important, but if we want to fix this, we need input from Jeroen Salman to re-establish the preferred order of the new keys.