one of two users selecting success choice now delivers success end-level message to all users

#### What's this PR do?

Previously ([see commit here](https://github.com/DoSomething/ds-mdata-responder/pull/121)) we changed the end-level game logic so that if one out of two players select the success choice, they receive the non-success end-level choice. 

Now, we're reversing this end-level game logic so that if one out of two players select the success choice, they receive the success end-level choice. 

#### How should this be manually tested?
Tested with Postman with two players and a variety of combinations: 1/2 success, 2/2 success, 0/2 success. 

#### What are the relevant tickets?
JIRA SMS-92.