On a configure screen that has multiple groups of radio buttons, clicking the apply button clears all but the last radio group selection

buildFormTree changes the DOM while parsing the radio button sections, mutating the name field of each element. Since the DOM model is that there can only be at most one selected element for each distinct name, the last radio button selected for each base name will be the only one selected.

The fix is not to mutate the DOM while building the JSON form data.