2015-08.py: For posterity, fix the 2 -> 1 swap in old version
2015-08.py: For posterity, fix the 2 -> 1 swap in old version

I must have done a replace somehow, but I’ve no idea how or why.
It was pestering me, while doing the test for the new-style part
two (which passes fine), why you would only add 1. Just a bug!

robjwells/adventofcode-solutions,robjwells/adventofcode-solutions,robjwells/adventofcode-solutions,robjwells/adventofcode-solutions,robjwells/adventofcode-solutions,robjwells/adventofcode-solutions