Corrected '--default-track' boolean value when user requests AC3 track to be default using '--default' argument.
Corrected '--default-track' boolean value when user requests AC3 track to be default using '--default' argument.
Merge branch 'master' of https://github.com/kangaroomadman/mkvdts2ac3.py
Merge pull request #9 from kangaroomadman/master

Corrected '--default-track' boolean value when user requests AC3 track to be default using '--default' argument.