unpackData is not called on service restart after MY_PACKAGE_REPLACED

There is currently no call to `unpackData` when a `PythonService` is started in the background, as a response to `MY_PACKAGE_REPLACED` intent (on app background update). This leaves restarted service running out-of-date bytecode.

Sample code for `MY_PACKAGE_REPLACED` receiver: [MyBroadcastReceiver](https://github.com/kivy/kivy/wiki/Starting-Kivy-App-and-Service-on-bootup-on-Android)

Read the MY_PACKAGE_REPLACED receiver example and trace how a background-started PythonService is launched. Locate the service-restart path and existing unpackData calls, then verify that the restarted service refreshes bytecode after an app update.

Written by the indexing model from the issue text.