Make PWA run standalone (fixes #264)

public/manifest.json

@@ -28,7 +28,7 @@
     "background_color": "#efefef",
     "start_url": "/",
     "scope": "/",
-    "display": "minimal-ui",
+    "display": "standalone",
     "theme_color": "#3367d6",
     "screenshots" : [
         {

public/scripts/main.js

@@ -101,7 +101,7 @@ class PairDrop {
     }
 
     onPwaInstallable(e) {
-        if (!window.matchMedia('(display-mode: minimal-ui)').matches) {
+        if (!window.matchMedia('(display-mode: standalone)').matches) {
             // only display install btn when not installed
             this.$headerInstallBtn.removeAttribute('hidden');
             this.$headerInstallBtn.addEventListener('click', () => {