install.sh: Remove commented "add repos" code that we don't need
install.sh: Remove commented "add repos" code that we don't need

distrib-updates, universe, and multiverse are already in
the default sources.list, so we won't need to uncomment
that code anyway. Besides, commenting out code
that we're testing isn't necessary since we have git.

freegeekchicago/fgc-installscript