Conforms to standard is VL-specific

[joachimnielandt]

When adding a "Conforms to standard" in Dataset > Standard > Distribution and choosing OGC API Features, a VL-specific value pops up.

Due to editor config: https://github.com/metadata101/dcat-ap/blob/main/src/main/plugin/dcat-ap/layout/config-editor.xml#L1811

[joachimnielandt]

Lower priority: make editor function first, then figure out the generic approach for these custom elements.