Fix: Android 15 status bar chip auto stop not handled (#190)

[imablanco]

This PR fixes MediaProjection's onStop callback not calling screen recording completion.
onStop callback is called by status bar notification chip auto-stop button in Android 15 but could happen in other scenarios:

• the screen is being locked
• another media projection session starts
• the app process is killed

Changes

Call ScreenRecordService stopSelf in onStop callback

Fixes

Fixes #190