Refactor text answers

The code we PR'd yesterday, merged to master and pushed to Heroku didn't work properly. Locally, we discovered the app would run but responses weren't being created when a text_answer was saved. On Heroku, the app would simply fail. We force pushed working code this AM to fix the issue. This PR is to show what changed.
I'd format it like this:


```ruby
 current_user.responses.create(
  answer: text_answer,
  question_id: question_id
)
```