Ah...
If you take a look at RefreshDisplay(), you will find two lines similar to this:
digitalWrite(digit0 + digitPosition, LOW); // Turn off previous digit
Each digit is turned on one at a time, so the above line turn off the previously on digit, adjust the segments for the next digit, and then turn on that next digit.
You should be able to adjust the calculation of the first parameter instead of re-wiring the circuit. Maybe something like this:
- Change digit0 from 10 to 13
- digitalWrite(digit0 - digitPosition, LOW); // Turn off previous digit
- digitalWrite(digit0 - digitPosition, HIGH);