Move to next set with a single push

[hunor86]

I just downloaded the app to my Pebble 2 and it is great, I love it. I found one usability issue though: You can only progress to the next move by holding down the righ-bottom button. It would make make the app much smoother if either the middle or the bottom button would be dedicated to move toward with only one single push of a button instead of having to hold it down. It should be a fairly easy fix in the code. Thanks!