Get rid of code and checks we don't need since this isn't a template

The quiz template does a bunch of checks because the data it receives
isn't always the same. We control the data used by this quiz so we
don't those anymore. We also don't need the old result text.
Add answer letters in front of answer choices

and show answer letter instead of full answer text if wrong answer
selected
Shuffle in added answer choices

Left them in place on the two that referenced other answers, but
shuffled the question position so they weren't next to each other