Android: no telemetry logs

No telemetry logs are written.
Save logs after each flight is checked.

QGC daily 2019-10-02
ArduCopter 3.6.11

Telemetry save on mobile is a little different than desktop. It is not on by default. Also the fact that there isn’t really an application close type of state on mobile. So the log is saved when the connection to the vehicle is disconnected. Even if you are only logging when armed.

I need to take a look through all of this again to see if can be made better. The current implementation on mobile in ancient history and hasn’t been looked at in a while.