Update on save instead of change

The role will now change on saving the form instead of on changing the
selected radio button.
If I clicked back to the original value, such that no change would happen on Save, the text should revert back to Done.

This might be better done in the view layer, using the {{#if_equals}} Mustache helper. (in other words, check if the id of the role already mapped is equal to the id of the one to be mapped).