Move the form 'source' logic to the actual FormSelectInput.
Move the form 'source' logic to the actual FormSelectInput.

This better supports that attribute when calling the form's data from another location, such as polling the options for some custom operation in the controller.

nicholasryan/CorePlus,nicholasryan/CorePlus,nicholasryan/CorePlus,nicholasryan/CorePlus,nicholasryan/CorePlus,nicholasryan/CorePlus,nicholasryan/CorePlus,nicholasryan/CorePlus