Fix match stop time retroactively#176

In some instances, I’ve forgotten to end the match on the watch. By the time I remember, I’m already home. This makes it appear as though I traveled 10+ miles in the last 20-30 minutes of the match, at breakneck speed.

Would be nice to be able to adjust the match stop time to actual time. And with that, delete the position and speed data that occurred after the new match end time.

This feature will be brilliant