[ADF-2755] Fix preview overlay (#3208)

* Fix overlay in the new sidenav

* Update wrong url

* Enrich BlobPreviewService

* Fix another previews

* Filepreview use the same router outlet

demo-shell/src/app/components/blob-preview/blob-preview.component.ts

@@ -0,0 +1,21 @@
+import { Component } from '@angular/core';
+import { PreviewService } from '../../services/preview.service';
+import { Router } from '@angular/router';
+
+@Component({
+    templateUrl: 'bob-preview.component.html'
+})
+export class BlobPreviewComponent {
+    content: Blob;
+    name: string;
+
+    constructor(preview: PreviewService, router: Router) {
+        if (preview.content === null || preview.name === null) {
+            router.navigate([{ outlets: { overlay: null } }]);
+            return;
+        }
+
+        this.content = preview.content;
+        this.name = preview.name;
+    }
+}

demo-shell/src/app/components/blob-preview/bob-preview.component.html

@@ -0,0 +1,5 @@
+<adf-viewer 
+    [showViewer]="true" 
+    [blobFile]="content" 
+    [displayName]="name">
+</adf-viewer>