make userDisplayName optional

react/common/src/IElixFormsComponentProperties.ts

@@ -1,6 +1,6 @@
 export interface IElixFormsComponentProperties {
   isDarkTheme?: boolean;
-  userDisplayName: string;
+  userDisplayName?: string;
   additionalFieldsJson?: string;
   
   // Layout Properties

react/recupero-proposta-cct-da-contratti/src/App.jsx

@@ -5,8 +5,6 @@ import config from './config.json';
 function App() {
   return (
     <RecuperoPropostaCctDaContrattiComponent
-      userDisplayName="XYZ"
-
       moduleName={config.component.moduleName}
       headerTitle={config.component.headerTitle}
       headerHeroImageSrc={config.component.headerHeroImageSrc}