#217 Fixed radio selects.

The radio selects weren't changing their respective state variables upon being clicked. I'm not entirely sure if valueLink works for radio selects so I put the onChange handler in, but there may be a more concise way of adjusting the state variable upon a change.
This doesn't work because the `checked` prop isn't the result of an expression, it's just always `true` and vice versa for the other one in this group. Checked should be the result of an expression that determines whether this radio button should be checked. In this case, the expression would be `this.state.program_type === ProgramTypes.CLUB`.