Answers for Bully Text changed to all either by A or B

#### What's this PR do?
It was a weird user experience where in one scenario, the player is asked to text back A or B as her choice. But then in the next scenario, she's asked to text back either C or D.

Content in Mobile Commons was updated to always ask for A or B, and this is for the backend config to expect that now too.

#### What are the relevant tickets?
SMS-2