Android: add unicast discovery domain + app icon

apps/android/app/src/main/AndroidManifest.xml

@@ -16,6 +16,8 @@
     <application
         android:name=".NodeApp"
         android:allowBackup="true"
+        android:icon="@mipmap/ic_launcher"
+        android:roundIcon="@mipmap/ic_launcher_round"
         android:label="@string/app_name"
         android:supportsRtl="true"
         android:theme="@style/Theme.ClawdisNode">