fix(showcase): adapt showcase for the braking change

When press Enter key now the search is trigger
Braking Change:
The Components
implementing
`StarkSearchFormComponent` must implement `submitEvent`
In the component template in
the <form > tag
`(ngSubmit)="submitEvent.next()" and add `<button [hidden]="true"
type="submit"></button>`
ISSUES CLOSED: NationalBankBelgium#3116

showcase/src/app/demo-ui/pages/generic-search/components/demo-generic-search-form.component.html

@@ -1,4 +1,4 @@
-<form fxLayout="row wrap" [formGroup]="searchForm">
+<form fxLayout="row wrap" [formGroup]="searchForm" (ngSubmit)="submitEvent.next()">
 	<!-- Year -->
 	<div fxFlex>
 		<mat-form-field>
@@ -27,4 +27,6 @@
 			<mat-option *ngFor="let option of movieOptions; trackBy: trackItemFn" [value]="option">{{ option }}</mat-option>
 		</mat-autocomplete>
 	</div>
+
+	<button [hidden]="true" type="submit"></button>
 </form>

showcase/src/app/demo-ui/pages/generic-search/components/demo-generic-search-form.component.ts

@@ -31,6 +31,9 @@ export class DemoGenericSearchFormComponent implements OnInit, StarkSearchFormCo
 	@Output()
 	public readonly workingCopyChanged = new EventEmitter<HeroMovieSearchCriteria>();
 
+	@Output()
+	public readonly submitEvent: EventEmitter<void> = new EventEmitter<void>();
+
 	public yearOptions: number[] = [];
 	public heroOptions: string[] = [];
 	public movieOptions: string[] = [];