fix(@schematics/angular): Make manifest.json correct and consistent

Closes #776

Author: webmaxru

packages/angular/pwa/pwa/files/assets/manifest.json

@@ -3,7 +3,7 @@
   "short_name": "<%= title %>",
   "theme_color": "#1976d2",
   "background_color": "#fafafa",
-  "display": "browser",
+  "display": "standalone",
   "scope": "/",
   "start_url": "/",
   "icons": [
@@ -47,6 +47,5 @@
       "sizes": "512x512",
       "type": "image/png"
     }
-  ],
-  "splash_pages": null
+  ]
 }

packages/schematics/angular/service-worker/index.ts

@@ -190,8 +190,7 @@ function updateIndexFile(options: ServiceWorkerOptions): Rule {
     const indent = getIndent(closingHeadTagLine) + '  ';
     const itemsToAdd = [
       '<link rel="manifest" href="assets/manifest.json">',
-      '<meta name="Description" content="Angular Application">',
-      '<meta name="theme-color" content="#FFFFFF">',
+      '<meta name="theme-color" content="#1976d2">',
     ];
 
     const textToInsert = itemsToAdd

packages/schematics/angular/service-worker/index_spec.ts

@@ -102,7 +102,6 @@ describe('Service Worker Schematic', () => {
     const content = tree.readContent('projects/bar/src/index.html');
 
     expect(content).toMatch(/<link rel="manifest" href="assets\/manifest.json">/);
-    expect(content).toMatch(/<meta name="Description" content="Angular Application">/);
-    expect(content).toMatch(/<meta name="theme-color" content="#FFFFFF">/);
+    expect(content).toMatch(/<meta name="theme-color" content="#1976d2">/);
   });
 });