fix form state for dropdown controls

minor cleanups

react/scelta-carriera/src/SceltaCarrieraComponent.tsx

@@ -43,7 +43,7 @@ export default class SceltaCarrieraComponent extends ElixFormsComponentAbstract
     );
   }
 
-  protected override renderExtraContent(): JSX.Element {
+  protected override renderExtraContentPost(): JSX.Element {
     return <p>Altre cose</p>;
   }
 }