Disable transfer patients button if user doesn't have more than one measure

#### Story ####
- https://www.pivotaltracker.com/story/show/68464574

#### Note ####
- ~~disabled transfer patients settings button on rendered event after checking collection size~~
- originally used ```@$('.toggle-measure-listing').prop('disabled', @measures.length <= 1 || @model.get('patients').length < 1)```, but decided to move toward template-based approach for cleaner UI updating