add android:banner attribute so TV apps display launcher icon correctly

Author: broccoliboy

pythonforandroid/bootstraps/webview/build/templates/AndroidManifest.tmpl.xml

@@ -42,6 +42,7 @@
     -->
     <application android:label="@string/app_name"
                  android:icon="@mipmap/icon"
+                 android:banner="@mipmap/banner"
                  android:allowBackup="{{ args.allow_backup }}"
                  {% if args.backup_rules %}android:fullBackupContent="@xml/{{ args.backup_rules }}"{% endif %}
                  android:theme="{{args.android_apptheme}}{% if not args.window %}.Fullscreen{% endif %}"