Use default display

Author: AB-xdev

demo/webapp-vaadin/src/main/resources/META-INF/resources/manifest.webmanifest

@@ -1,7 +1,6 @@
 {
     "name": "Demo",
     "short_name": "Demo",
-    "display": "standalone",
     "background_color": "#c02222",
     "theme_color": "#c02222",
     "start_url": ".",