android (service): set autorestart: with this option, the backend will automatically restart as soon as terminated. This is notably important at the moment to work around a P4A bug which result in a backend killed when frontend is closed (cf. https://github.com/kivy/python-for-android/issues/2053)

<intent-filter>
    <action android:name="android.intent.action.SEND" />
    <category android:name="android.intent.category.DEFAULT" />
    <data android:mimeType="*/*" />
</intent-filter>